Build Error Help

Can someone please try and locate the error for me? I don’t even see what is wrong, let alone trying to solve it?

UATHelper: Packaging (Windows (64-bit)): Project.Build: ********** BUILD COMMAND COMPLETED **********
UATHelper: Packaging (Windows (64-bit)): Project.Cook: ********** COOK COMMAND STARTED **********
UATHelper: Packaging (Windows (64-bit)): CommandUtils.RunCommandlet: Running UE4Editor Cook for project D:\VirtuosoJune2017\Virtuoso\Virtuoso\Virtuoso.uproject
UATHelper: Packaging (Windows (64-bit)): CommandUtils.RunCommandlet: Commandlet log file is D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Programs\AutomationTool\Saved\Cook-2017.10.17-18.09.24.txt
UATHelper: Packaging (Windows (64-bit)): CommandUtils.Run: Run: D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Binaries\Win64\UE4Editor-Cmd.exe D:\VirtuosoJune2017\Virtuoso\Virtuoso\Virtuoso.uproject -run=Cook -NoLogTimes -TargetPlatform=WindowsNoEditor -fileopenlog -unversioned -abslog=D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Prog
rams\AutomationTool\Saved\Cook-2017.10.17-18.09.24.txt -stdout -CrashForUAT -unattended -UTF8Output
UATHelper: Packaging (Windows (64-bit)): Cook: LogInit:Display: Running engine for game: Virtuoso
UATHelper: Packaging (Windows (64-bit)): Cook: LogInit:Display: RandInit(1806454418) SRandInit(1806454418).
UATHelper: Packaging (Windows (64-bit)): Cook: LogPluginManager:Warning: Engine version string in …/…/…/…/…/Virtuoso/Virtuoso/Plugins/VaRest/VaRestPlugin.uplugin could not be parsed (“4.16”)
UATHelper: Packaging (Windows (64-bit)): Cook: LogShaderCompilers:Display: Using Local Shader Compiler.
UATHelper: Packaging (Windows (64-bit)): Cook: LogDerivedDataCache:Display: Max Cache Size: 512 MB
UATHelper: Packaging (Windows (64-bit)): Cook: LogDerivedDataCache:Display: Loaded Boot cache: …/…/…/…/…/Virtuoso/Virtuoso/DerivedDataCache/Boot.ddc
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP AllDesktopTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP MacClientTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP MacNoEditorTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP MacServerTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP MacTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP WindowsClientTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP WindowsNoEditorTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP WindowsServerTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP WindowsTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP AndroidTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP Android_ASTCTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP Android_ATCTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP Android_DXTTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP Android_ETC1TargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP Android_ETC2TargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP Android_MultiTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP Android_PVRTCTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP HTML5TargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP IOSTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTemp:Display: Loaded TP TVOSTargetPlatform
UATHelper: Packaging (Windows (64-bit)): Cook: LogTargetPlatformManager:Display: Building Assets For WindowsNoEditor
UATHelper: Packaging (Windows (64-bit)): Cook: LogCollisionProfile:Warning: Profile (UI) - Custom Channel Name = ‘Weapon’ hasn’t been found
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: === Critical error: ===
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error:
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: Assertion failed: Result [File:D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Developer\TargetPlatform\Private\TargetPlatformManagerModule.cpp] [Line: 497]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error:
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error:
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error:
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: KERNELBASE.dll!0x00000000DEC93C58
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:120]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Core.dll!FOutputDevice::Logf__VA() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Core.dll!FDebug::AssertFailed() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-TargetPlatform.dll!FTargetPlatformManagerModule::ShaderFormatVersion() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\developer\targetplatform\private\targetplatformmanagermodule.cpp:499]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Engine.dll!GetMaterialShaderMapKeyString() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\engine\private\materials\materialshader.cpp:95]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Engine.dll!FMaterialShaderMap::LoadFromDerivedDataCache() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\engine\private\materials\materialshader.cpp:872]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Engine.dll!FMaterial::CacheShaders() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\engine\private\materials\materialshared.cpp:1614]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Engine.dll!UMaterialInstance::CacheShadersForResources() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\engine\private\materials\materialinstance.cpp:1744]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Engine.dll!UMaterialInstance::CacheResourceShadersForCooking() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\engine\private\materials\materialinstance.cpp:1722]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Engine.dll!UMaterialInstance::BeginCacheForCookedPlatformData() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\engine\private\materials\materialinstance.cpp:1883]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Engine.dll!UMaterialInstance::PostLoad() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\engine\private\materials\materialinstance.cpp:2084]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!UObject::ConditionalPostLoad() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\obj.cpp:952]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!EndLoad() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1535]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!LoadPackageInternal() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1289]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!LoadPackage() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1377]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!ResolveName() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:778]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!StaticLoadObjectInternal() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:865]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!StaticLoadObject() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:929]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-UMG.dll!ConstructorHelpersInternal::FindOrLoadObject() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\public\uobject\constructorhelpers.h:35]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-UMG.dll!UWidgetComponent::UWidgetComponent() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\umg\private\components\widgetcomponent.cpp:573]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!UClass::CreateDefaultObject() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\class.cpp:2687]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!UObjectLoadAllCompiledInDefaultProperties() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:816]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-CoreUObject.dll!ProcessNewlyLoadedUObjects() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:894]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Cmd.exe!FEngineLoop::PreInit() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\launch\private\launchengineloop.cpp:1788]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Cmd.exe!GuardedMain() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\launch\private\launch.cpp:127]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Cmd.exe!GuardedMainWrapper() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Cmd.exe!WinMain() [d:\virtuosojune2017\engine16\unrealengine-release\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: KERNEL32.DLL!0x00000000DFE78364
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: ntdll.dll!0x00000000E1B57091
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: ntdll.dll!0x00000000E1B57091
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error:
UATHelper: Packaging (Windows (64-bit)): Cook: LogWindows:Error: end: stack for UAT
UATHelper: Packaging (Windows (64-bit)): CommandUtils.Run: Run: Took 10.7250418s to run UE4Editor-Cmd.exe, ExitCode=3
UATHelper: Packaging (Windows (64-bit)): Project.Cook: Cook failed. Deleting cooked data.
UATHelper: Packaging (Windows (64-bit)): Program.Main: ERROR: AutomationTool terminated with exception: AutomationTool.AutomationException: Cook failed. —> AutomationTool.CommandletException: BUILD FAILED: Failed while running Cook for D:\VirtuosoJune2017\Virtuoso\Virtuoso\Virtuoso.uproject; see log D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine
Programs\AutomationTool\Saved\Logs\Cook-2017.10.17-18.09.35.txt
UATHelper: Packaging (Windows (64-bit)): at AutomationTool.CommandUtils.RunCommandlet(FileReference ProjectName, String UE4Exe, String Commandlet, String Parameters) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\AutomationUtils\CommandletUtils.cs:line 407
UATHelper: Packaging (Windows (64-bit)): at AutomationTool.CommandUtils.CookCommandlet(FileReference ProjectName, String UE4Exe, String[] Maps, String[] Dirs, String InternationalizationPreset, String[] CulturesToCook, String TargetPlatform, String Parameters) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\Autom
ationUtils\CommandletUtils.cs:line 112
UATHelper: Packaging (Windows (64-bit)): at Project.Cook(ProjectParams Params) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\Scripts\CookCommand.Automation.cs:line 408
UATHelper: Packaging (Windows (64-bit)): — End of inner exception stack trace —
UATHelper: Packaging (Windows (64-bit)): at Project.Cook(ProjectParams Params) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\Scripts\CookCommand.Automation.cs:line 423
UATHelper: Packaging (Windows (64-bit)): at BuildCookRun.DoBuildCookRun(ProjectParams Params) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\Scripts\BuildCookRun.Automation.cs:line 208
UATHelper: Packaging (Windows (64-bit)): at BuildCookRun.ExecuteBuild() in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\Scripts\BuildCookRun.Automation.cs:line 40
UATHelper: Packaging (Windows (64-bit)): at AutomationTool.BuildCommand.Execute() in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\AutomationUtils\BuildCommand.cs:line 100
UATHelper: Packaging (Windows (64-bit)): at AutomationTool.Automation.Execute(List1 CommandsToExecute, CaselessDictionary1 Commands) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\AutomationUtils\Automation.cs:line 566
UATHelper: Packaging (Windows (64-bit)): at AutomationTool.Automation.Process(String[] Arguments) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\AutomationUtils\Automation.cs:line 536
UATHelper: Packaging (Windows (64-bit)): at AutomationTool.Program.MainProc(Object Param) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\Program.cs:line 133
UATHelper: Packaging (Windows (64-bit)): at AutomationTool.InternalUtils.RunSingleInstance(Func`2 Main, Object Param) in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\AutomationUtils\Utils.cs:line 704
UATHelper: Packaging (Windows (64-bit)): at AutomationTool.Program.Main() in D:\VirtuosoJune2017\Engine16\UnrealEngine-release\Engine\Source\Programs\AutomationTool\Program.cs:line 57
UATHelper: Packaging (Windows (64-bit)): Program.Main: AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults:Error: Error Unknown Cook Failure

Thank you!

Well, It’s a big mess of words and letters, but I often see this recurring: Error: " UE4Editor-Core.dll! "
Sounds like something is wrong with the engine itself. Check if your engine is up to date. Otherwise I would say try to change between this version and an older one. You could also try to re-install. Or just contact tech support.
I would sure as heck make good backups of your projects before doing anything I suggested to avoid your work being lost in the process.

I am no tech genius and I never had this problem, but I hope it helps you.