# C++ Transition Guide for 4.18 **URL:** \ **Category:** C++\ **Tags:** unreal-engine\ **Created:** [October 24, 2017, 9:29pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714 "2017-10-24T21:29:20Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Rama](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/rama/32/882413_2.png) [@Rama](https://forums.unrealengine.com/u/Rama)\ **Post date:** [October 24, 2017, 9:29pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/1 "2017-10-24T21:29:20Z")
Dear Community, Cheers and fireworks for 4.18! Yay! Here is a thread where you can post your research & solutions as you are upgrading to 4.18. Questions are welcome here about C++, as well as any other editor-related aspects of 4.18 that you think might be common issues. Have fun upgrading! ❤ Rama ---
**Author:** ![Rama](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/rama/32/882413_2.png) [@Rama](https://forums.unrealengine.com/u/Rama)\ **Post date:** [October 24, 2017, 10:33pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/2 "2017-10-24T22:33:40Z")
**Can’t Make VS Files For Your Project?** **The New Target.cs** Are you finding you can’t generate VS files for your project? Beginning with 4.18 you must use the new target.cs setup old: ```auto public class PMeleeWeaponTarget : TargetRules { public PMeleeWeaponTarget(TargetInfo Target) { Type = TargetType.Game; } public override void SetupBinaries( TargetInfo Target, ref List OutBuildBinaryConfigurations, ref List OutExtraModuleNames ) { OutExtraModuleNames.AddRange( new string] { "PMeleeWeapon" } ); } } ``` **New:** ```auto public class PMeleeWeaponTarget : TargetRules { public PMeleeWeaponTarget(TargetInfo Target) : base(Target) { Type = TargetType.Game; ExtraModuleNames.Add("PMeleeWeapon"); } } ``` Editor Old ```auto public class PMeleeWeaponEditorTarget : TargetRules { public PMeleeWeaponEditorTarget(TargetInfo Target) { Type = TargetType.Editor; } // // TargetRules interface. // public override void SetupBinaries( TargetInfo Target, ref List OutBuildBinaryConfigurations, ref List OutExtraModuleNames ) { OutExtraModuleNames.AddRange( new string] { "PMeleeWeapon" } ); } } ``` **Editor New** ```auto public class PMeleeWeaponEditorTarget : TargetRules { public PMeleeWeaponEditorTarget(TargetInfo Target) : base(Target) { Type = TargetType.Editor; ExtraModuleNames.Add("PMeleeWeapon"); } } ``` ❤ Rama ---
**Author:** ![User-970075953](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@User-970075953](https://forums.unrealengine.com/u/User-970075953)\ **Post date:** [October 25, 2017, 9:41am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/3 "2017-10-25T09:41:35Z")
The HMD device location has changed - but it’s a pretty simple fix up: Previously if you did: ```auto EHMDDeviceType::Type device = GEngine->HMDDevice.Get() ``` You now do: ```auto EHMDDeviceType::Type device = GEngine->XRSystem->GetHMDDevice() ``` and #include “IXRTrackingSystem.h” And it should all work as before. ---
**Author:** ![BrUnO\_XaVIeR](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bruno_xavier/32/1110230_2.png) [@BrUnO\_XaVIeR](https://forums.unrealengine.com/u/BrUnO_XaVIeR)\ **Post date:** [October 25, 2017, 7:32pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/4 "2017-10-25T19:32:30Z")
Got this one: > [@](#): > > ‘UPrimitiveComponent::GetPhysicsAngularVelocity’: Use GetPhysicsAngularVelocityInDegrees instead. Please update your code to the new API before upgrading to the next release, otherwise your project will no longer compile. And this: > [@](#): > > fatal error C1083: Cannot open include file: ‘Interfaces/IImageWrapper.h’: No such file or directory > fatal error C1083: Cannot open include file: ‘Interfaces/IImageWrapperModule.h’: No such file or directory Both was moved to a public folder: ```auto #include "IImageWrapper.h" #include "IImageWrapperModule.h" ``` ---
**Author:** ![Devero](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Devero](https://forums.unrealengine.com/u/Devero)\ **Post date:** [October 25, 2017, 8:34pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/5 "2017-10-25T20:34:58Z")
Hi guys, Anyone else getting compile errors on a vanilla github 4.18 source compile? I"m getting these errors and seem to be in the engine side: GitEngines\UnrealEngine\_4.18.0\Engine\Source\Programs\Mac\ShaderCacheTool\Private\ShaderCacheTool.cpp(66): error C2039: ‘MergeShaderCacheFiles’: is not a member of ‘FShaderCache’ … and… GitEngines\UnrealEngine\_4.18.0\Engine\Source\Programs\BuildPatchTool\Private\ToolModes\AutomationMode.cpp(12): fatal error C1083: Cannot open include file: ‘Interfaces/IAutomationWorkerModule.h’: No such file or directory ---
**Author:** ![Dark583](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Dark583](https://forums.unrealengine.com/u/Dark583)\ **Post date:** [October 25, 2017, 10:58pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/6 "2017-10-25T22:58:04Z")
How do i properly relink the Destruction Apex Class since they moved it to be a plugin? [https://i.gyazo.com/3d691d86ff09b038640c880a12836ee9.png](https://i.gyazo.com/3d691d86ff09b038640c880a12836ee9.png) ---
**Author:** ![kevterm](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@kevterm](https://forums.unrealengine.com/u/kevterm)\ **Post date:** [October 26, 2017, 4:44am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/7 "2017-10-26T04:44:15Z")
Are the DPI related functions (e.g. FGenericPlatformMisc::ConvertInchesToPixels) gone in 4.18? Is there a new way for calculating DPI? Thank you. ---
**Author:** ![Zoc](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/zoc/32/88714_2.png) [@Zoc](https://forums.unrealengine.com/u/Zoc)\ **Post date:** [October 26, 2017, 5:28am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/8 "2017-10-26T05:28:43Z")
One of the [FONT=courier new]FTimespan() constructors changed signature from ```auto FTimespan(int32 Days, int32 Hours, int32 Minutes, int32 Seconds, int32 Milliseconds, int32 Microseconds = 0) ``` to ```auto FTimespan(int32 Days, int32 Hours, int32 Minutes, int32 Seconds, int32 FractionNano) ``` The easiest way to fix this is use one of the built in static functions (In my case, I used [FONT=courier new]FTimespan::FromSeconds(DeltaTime) ) – [FONT=courier new]FBodyInstance functions [FONT=courier new]SetAngularVelocity() and [FONT=courier new]GetUnrealWorldAngularVelocity() are now deprecated To fix, use their [FONT=courier new]SetAngularVelocityInRadians() and [FONT=courier new]GetUnrealWorldAngularVelocityInRadians() variants instead. Don’t forget to call [FONT=courier new]FMath:: DegreesToRadians() where needed! ---
**Author:** ![Rama](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/rama/32/882413_2.png) [@Rama](https://forums.unrealengine.com/u/Rama)\ **Post date:** [October 30, 2017, 4:31am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/9 "2017-10-30T04:31:49Z")
> [@Dark583](#): > > How do i properly relink the Destruction Apex Class since they moved it to be a plugin? [https://i.gyazo.com/3d691d86ff09b038640c880a12836ee9.png](https://i.gyazo.com/3d691d86ff09b038640c880a12836ee9.png) Add to your .uproject or your .uplugin: ```auto "Plugins" : { "Name": "ApexDestruction", "Enabled": true } ] ``` ❤ Rama ---
**Author:** ![Rama](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/rama/32/882413_2.png) [@Rama](https://forums.unrealengine.com/u/Rama)\ **Post date:** [October 30, 2017, 4:32am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/10 "2017-10-30T04:32:34Z")
> [@Devero](#): > > Hi guys, > > Anyone else getting compile errors on a vanilla github 4.18 source compile? I"m getting these errors and seem to be in the engine side: > > GitEngines\UnrealEngine\_4.18.0\Engine\Source\Programs\Mac\ShaderCacheTool\Private\ShaderCacheTool.cpp(66): error C2039: ‘MergeShaderCacheFiles’: is not a member of ‘FShaderCache’ > > … and… > > GitEngines\UnrealEngine\_4.18.0\Engine\Source\Programs\BuildPatchTool\Private\ToolModes\AutomationMode.cpp(12): fatal error C1083: Cannot open include file: ‘Interfaces/IAutomationWorkerModule.h’: No such file or directory Hi Devero!!! Did this ever get resolved? 🙂 Rama ---
**Author:** ![SolidGasStudios](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/solidgasstudios/32/1194575_2.png) [@SolidGasStudios](https://forums.unrealengine.com/u/SolidGasStudios)\ **Post date:** [October 30, 2017, 8:41am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/11 "2017-10-30T08:41:43Z")
> [@Devero](#): > > Hi guys, > > Anyone else getting compile errors on a vanilla github 4.18 source compile? I"m getting these errors and seem to be in the engine side: > > GitEngines\UnrealEngine\_4.18.0\Engine\Source\Programs\Mac\ShaderCacheTool\Private\ShaderCacheTool.cpp(66): error C2039: ‘MergeShaderCacheFiles’: is not a member of ‘FShaderCache’ > > … and… > > GitEngines\UnrealEngine\_4.18.0\Engine\Source\Programs\BuildPatchTool\Private\ToolModes\AutomationMode.cpp(12): fatal error C1083: Cannot open include file: ‘Interfaces/IAutomationWorkerModule.h’: No such file or directory Remove the ShaderCacheTool project from your solution. For ‘Interfaces/IAutomationWorkerModule.h’ remove the ‘Interfaces/’ portion. ---
**Author:** ![anonymous\_user\_4c6380f9](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_4c6380f9](https://forums.unrealengine.com/u/anonymous_user_4c6380f9)\ **Post date:** [October 31, 2017, 1:03pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/14 "2017-10-31T13:03:47Z")
I noticed that the module containing FGamepadKeyNames has been changed from Core to ApplicationCore. ```auto struct **CORE_API** FGamepadKeyNames { typedef FName Type; ... struct **APPLICATIONCORE_API** FGamepadKeyNames { typedef FName Type; ... ``` ---
**Author:** ![Altrue](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/altrue/32/1186768_2.png) [@Altrue](https://forums.unrealengine.com/u/Altrue)\ **Post date:** [October 31, 2017, 10:04pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/16 "2017-10-31T22:04:13Z")
Since updating to 4.18, I am seeing this wierd non-fatal crash in the log my dedicated server and client on linux and windows: (Important bits in **underlined bold** ) ```auto [2017.10.31-21.55.14:751] 0]LogPakFile: New pak file ../../../ProjectName/Content/Paks/ProjectName-WindowsNoEditor.pak added to pak precacher. [2017.10.31-21.55.15:023] 0]LogStats: FPlatformStackWalk::StackWalkAndDump - 0.164 s [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: === Handled ensure: === [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: Ensure condition failed: Lhs.Array.Num() == Lhs.InitialNum [File:c:\users\altrue\documents\unrealengine\engine\source\runtime\core\public\Containers/SparseArray.h] [Line: 781] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: **Container has changed during ranged-for iteration!** [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: Stack: [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x0000000040271766 ProjectName.exe!FWindowsPlatformStackWalk::StackWalkAndDump() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:200] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x00000000400106C1 ProjectName.exe!FDebug::EnsureFailed() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\misc\assertionmacros.cpp:299] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000004002AA06 ProjectName.exe!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\misc\assertionmacros.cpp:425] **[2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x0000000042DCC415 ProjectName.exe!FPakAsyncReadFileHandle::DoProcessing() [c:\users\altrue\documents\unrealengine\engine\source\runtime\pakfile\private\iplatformfilepak.cpp:3218]** [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x0000000042DCED96 ProjectName.exe!TGraphTask::ExecuteTask() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\public\async askgraphinterfaces.h:787] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000003FEE5D15 ProjectName.exe!FTaskThreadAnyThread::ProcessTasks() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\async askgraph.cpp:910] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000003FEE6F8D ProjectName.exe!FTaskThreadAnyThread::ProcessTasksUntilQuit() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\async askgraph.cpp:786] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000003FEF5455 ProjectName.exe!FTaskThreadBase::Run() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\async askgraph.cpp:502] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000004026F41C ProjectName.exe!FRunnableThreadWin::Run() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000004025FF63 ProjectName.exe!FRunnableThreadWin::GuardedRun() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:33] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x00000000771959CD kernel32.dll!UnknownFunction ] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x00000000773CA561 ntdll.dll!UnknownFunction ] [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: ``` The game still runs but it’s quite ugly to systematically have a stacktrace at the beginning of your logs. Besides, it’s just broken code waiting to happen… Any ideas? ---
**Author:** ![BrUnO\_XaVIeR](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bruno_xavier/32/1110230_2.png) [@BrUnO\_XaVIeR](https://forums.unrealengine.com/u/BrUnO_XaVIeR)\ **Post date:** [November 1, 2017, 2:29pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/17 "2017-11-01T14:29:16Z")
> [@Altrue](#): > > Since updating to 4.18, I am seeing this wierd non-fatal crash in the log my dedicated server and client on linux and windows: > (Important bits in **underlined bold** ) > > ```auto > > [2017.10.31-21.55.14:751] 0]LogPakFile: New pak file ../../../ProjectName/Content/Paks/ProjectName-WindowsNoEditor.pak added to pak precacher. > [2017.10.31-21.55.15:023] 0]LogStats: FPlatformStackWalk::StackWalkAndDump - 0.164 s > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: === Handled ensure: === > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: Ensure condition failed: Lhs.Array.Num() == Lhs.InitialNum [File:c:\users\altrue\documents\unrealengine\engine\source\runtime\core\public\Containers/SparseArray.h] [Line: 781] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: **Container has changed during ranged-for iteration!** > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: Stack: > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x0000000040271766 ProjectName.exe!FWindowsPlatformStackWalk::StackWalkAndDump() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:200] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x00000000400106C1 ProjectName.exe!FDebug::EnsureFailed() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\misc\assertionmacros.cpp:299] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000004002AA06 ProjectName.exe!FDebug::OptionallyLogFormattedEnsureMessageReturningFalse() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\misc\assertionmacros.cpp:425] > **[2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x0000000042DCC415 ProjectName.exe!FPakAsyncReadFileHandle::DoProcessing() [c:\users\altrue\documents\unrealengine\engine\source\runtime\pakfile\private\iplatformfilepak.cpp:3218]** > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x0000000042DCED96 ProjectName.exe!TGraphTask::ExecuteTask() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\public\async askgraphinterfaces.h:787] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000003FEE5D15 ProjectName.exe!FTaskThreadAnyThread::ProcessTasks() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\async askgraph.cpp:910] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000003FEE6F8D ProjectName.exe!FTaskThreadAnyThread::ProcessTasksUntilQuit() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\async askgraph.cpp:786] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000003FEF5455 ProjectName.exe!FTaskThreadBase::Run() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\async askgraph.cpp:502] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000004026F41C ProjectName.exe!FRunnableThreadWin::Run() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x000000004025FF63 ProjectName.exe!FRunnableThreadWin::GuardedRun() [c:\users\altrue\documents\unrealengine\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:33] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x00000000771959CD kernel32.dll!UnknownFunction ] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: [Callstack] 0x00000000773CA561 ntdll.dll!UnknownFunction ] > [2017.10.31-21.55.15:023] 0]LogOutputDevice: Error: > > ``` > > The game still runs but it’s quite ugly to systematically have a stacktrace at the beginning of your logs. Besides, it’s just broken code waiting to happen.. > Any ideas? Somewhere in your code you are modifying an array while iterating through it which may cause pointer invalidation depending on the way you’re doing it: > ---
**Author:** ![Altrue](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/altrue/32/1186768_2.png) [@Altrue](https://forums.unrealengine.com/u/Altrue)\ **Post date:** [November 1, 2017, 4:01pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/18 "2017-11-01T16:01:25Z")
> [@BrUnO\_XaVIeR](#): > > Somewhere in your code you are modifying an array while iterating through it which may cause pointer invalidation depending on the way you’re doing it: > > [https://stackoverflow.com/questions/16904454/what-is-iterator-invalidation](https://stackoverflow.com/questions/16904454/what-is-iterator-invalidation) Yes, though it happens at the line 3218 of some pak processing code, which is in the engine code itself and not in my code. Besides, both assertions containing this “\*\*Container has changed during ranged-for iteration!”\*\*text haven’t been modified between 4.17 and 4.18, leading me to believe that even if by some miracle the stacktrace was completely off, and my code was at fault, I would have seen this message in the 4.17 builds. This seems a bit big for an engine bug though, I mean surely that kind of thing in the logs wouldn’t have passed QA. So I’m guessing this is a 4.17 -\> 4.18 transition thing, hence my posting here. Is there any modification to do regarding the way we handle paks or something? ---
**Author:** ![imerovic](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@imerovic](https://forums.unrealengine.com/u/imerovic)\ **Post date:** [November 1, 2017, 6:14pm UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/19 "2017-11-01T18:14:01Z")
> [@Ninja\_K](#): > > I noticed an annoying 4.18 bug I think. I can’t join a dedicated server as a client from the command line anymore. It works when I do the exact same thing in 4.17 (with modifying the UE4 path of course). When I do it in 4.18, I just get a black screen. This is what I typed in command prompt. > > “C:\Program Files\Epic Games\UE\_4.18\Engine\Binaries\Win64\UE4Editor.exe” “C:\UnrealProjects\Testing\Testing.uproject” -server -log > > “C:\Program Files\Epic Games\UE\_4.18\Engine\Binaries\Win64\UE4Editor.exe” “C:\UnrealProjects\Testing\Testing.uproject” 192.168.2.21 -game -log > > It says everything is connected in the log but I just get a black screen for the client window. What’s going on? seems like in 4.18 you have to specify starting map, something like this: “C:\Program Files\Epic Games\UE\_4.18\Engine\Binaries\Win64\UE4Editor.exe” “C:\UnrealProjects\Testing\Testing.uproject” /Game/ThirdPersonCPP/Maps/ThirdPersonExampleMap -server -log ---
**Author:** ![Ninja\_K](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Ninja\_K](https://forums.unrealengine.com/u/Ninja_K)\ **Post date:** [November 2, 2017, 1:09am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/20 "2017-11-02T01:09:13Z")
> [@imerovic](#): > > seems like in 4.18 you have to specify starting map, something like this: > > “C:\Program Files\Epic Games\UE\_4.18\Engine\Binaries\Win64\UE4Editor.exe” “C:\UnrealProjects\Testing\Testing.uproject” /Game/ThirdPersonCPP/Maps/ThirdPersonExampleMap -server -log It’s working! Thx man, you’re the best! ---
**Author:** ![Softavi](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Softavi](https://forums.unrealengine.com/u/Softavi)\ **Post date:** [November 3, 2017, 9:52am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/21 "2017-11-03T09:52:04Z")
Hi, My commandlet plugin crashes after upgrading from 4.17 to 4.18. It crashes inside UE after calling UPackage::SavePackage: UPackage::SavePackage(AssetPackage, NULL, RF\_Standalone, \*PackageFileName, GError, nullptr, false, true, SAVE\_NoError) Where, - AssetPackage is the pointer to an UPackage returned by FindPackage. - PackageFileName is the string returned by FPackageName::LongPackageNameToFilename. The error I get is: LogWindows: Error: Fatal error: [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 278] LogWindows: Error: Illegal call to StaticFindObject() while serializing object data! Do you know what could have changed to cause the crash? Thanks ---
**Author:** ![Jambax](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jambax/32/904177_2.png) [@Jambax](https://forums.unrealengine.com/u/Jambax)\ **Post date:** [November 3, 2017, 10:15am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/22 "2017-11-03T10:15:16Z")
> [@Devero](#): > > Hi guys, > > Anyone else getting compile errors on a vanilla github 4.18 source compile? I"m getting these errors and seem to be in the engine side: > > GitEngines\UnrealEngine\_4.18.0\Engine\Source\Programs\Mac\ShaderCacheTool\Private\ShaderCacheTool.cpp(66): error C2039: ‘MergeShaderCacheFiles’: is not a member of ‘FShaderCache’ > > … and… > > GitEngines\UnrealEngine\_4.18.0\Engine\Source\Programs\BuildPatchTool\Private\ToolModes\AutomationMode.cpp(12): fatal error C1083: Cannot open include file: ‘Interfaces/IAutomationWorkerModule.h’: No such file or directory Yes! I’m getting both of those! Did you manage to fix it? ---
**Author:** ![Softavi](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Softavi](https://forums.unrealengine.com/u/Softavi)\ **Post date:** [November 3, 2017, 10:30am UTC](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714/23 "2017-11-03T10:30:42Z")
> [@Softavi](#): > > Hi, > > My commandlet plugin crashes after upgrading from 4.17 to 4.18. It crashes inside UE after calling UPackage::SavePackage: > > UPackage::SavePackage(AssetPackage, NULL, RF\_Standalone, \*PackageFileName, GError, nullptr, false, true, SAVE\_NoError) > > Where, > > - AssetPackage is the pointer to an UPackage returned by FindPackage. > - PackageFileName is the string returned by FPackageName::LongPackageNameToFilename. > > The error I get is: > > LogWindows: Error: Fatal error: [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 278] > LogWindows: Error: Illegal call to StaticFindObject() while serializing object data! > > Do you know what could have changed to cause the crash? > > Thanks This is the full call stack: LogWindows: Error: === Critical error: === LogWindows: Error: LogWindows: Error: Fatal error: [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 278] LogWindows: Error: Illegal call to StaticFindObject() while serializing object data! LogWindows: Error: LogWindows: Error: LogWindows: Error: [Callstack] 0x00000000FD8AA06D KERNELBASE.dll!UnknownFunction ] LogWindows: Error: [Callstack] 0x00000000F38476D4 UE4Editor-ApplicationCore.dll!FWindowsErrorOutputDevice::Serialize() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\applicationcore\private\windows\windowserroroutputdevice.cpp:65] LogWindows: Error: [Callstack] 0x00000000DA8A2E0B UE4Editor-Core.dll!FOutputDevice::Logf\_\_VA() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:70] LogWindows: Error: [Callstack] 0x00000000DA8347D9 UE4Editor-Core.dll!FDebug::AssertFailed() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:414] LogWindows: Error: [Callstack] 0x00000000DA3E1CFC UE4Editor-CoreUObject.dll!StaticFindObject() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:281] LogWindows: Error: [Callstack] 0x00000000D872A448 UE4Editor-Engine.dll!UStaticMesh::GetAssetRegistryTags() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\engine\private\staticmesh.cpp:1995] LogWindows: Error: [Callstack] 0x00000000DA37A352 UE4Editor-CoreUObject.dll!UPackage::SaveAssetRegistryData() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:5635] LogWindows: Error: [Callstack] 0x00000000DA373D17 UE4Editor-CoreUObject.dll!UPackage::Save() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:4616] LogWindows: Error: [Callstack] 0x00000000DA37A632 UE4Editor-CoreUObject.dll!UPackage::SavePackage() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:5480] LogWindows: Error: [Callstack] 0x00000000BF0313E9 UE4Editor-CommandletPlugin.dll!UApplyMaterialsCommandlet::Main() [c: emp\commandletplugin\hostproject\plugins\commandletplugin\source\commandletplugin\private\commandlets\applymaterialscommandlet.cpp:250] LogWindows: Error: [Callstack] 0x000000003FF3D25F UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2167] LogWindows: Error: [Callstack] 0x000000003FF3525A UE4Editor-Cmd.exe!GuardedMain() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\launch.cpp:127] LogWindows: Error: [Callstack] 0x000000003FF354AA UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134] LogWindows: Error: [Callstack] 0x000000003FF42379 UE4Editor-Cmd.exe!WinMain() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210] LogWindows: Error: [Callstack] 0x000000003FF43193 UE4Editor-Cmd.exe!\_\_scrt\_common\_main\_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe\_common.inl:253] LogWindows: Error: [Callstack] 0x00000000779759CD kernel32.dll!UnknownFunction ] LogWindows: Error: [Callstack] 0x0000000077BAA561 ntdll.dll!UnknownFunction ] ogWindows: Error: [Callstack] 0x0000000077BAA561 ntdll.dll!UnknownFunction ] [Next page](https://forums.unrealengine.com/t/c-transition-guide-for-4-18/101714.md?page=2)