# Crashes while using extended CharacterMovementComponent

**URL:** <https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748>\
**Category:** C++\
**Tags:** unreal-engine\
**Created:** [March 19, 2015, 10:18am UTC](https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748 "2015-03-19T10:18:44Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sharsnik](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sharsnik](https://forums.unrealengine.com/u/Sharsnik)\
**Post date:** [March 19, 2015, 10:18am UTC](https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748/1 "2015-03-19T10:18:44Z")

</div>

I’m having trouble extending the CharacterMovementComponent in the Character class. I’ve gotten one of 3 errors each time I try to hotload the code into the editor. (Reloading the editor after compiling doesn’t seem to work either). Hopefully it’s just some syntax error in my declarations.

Here’s my code, and the errors at the bottom (This is using 4.7.2):

MyProjectCharacterMovementComponent.h

```auto

UCLASS()
class UMyProjectCharacterMovementComponent : public UCharacterMovementComponent
{
	GENERATED_BODY()
};

```

MyProjectCharacterMovementComponent.cpp

```auto

//No code as of yet

```

MyProjectCharacter.cpp (Version 1)

```auto

AMyProjectCharacter::AMyProjectCharacter(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer.SetDefaultSubobjectClass<UMyProjectCharacterMovementComponent>(ACharacter::CharacterMovementComponentName))
{
...

```

MyProjectCharacter.cpp (Version 2)

```auto

AMyProjectCharacter::AMyProjectCharacter(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{
	if (!HasAnyFlags(RF_TagGarbageTemp))
	{
		ObjectInitializer.SetDefaultSubobjectClass<UMyProjectCharacterMovementComponent>(ACharacter::CharacterMovementComponentName);
	}
...

```

MyProjectCharacter.cpp (Version 3)

```auto

AMyProjectCharacter::AMyProjectCharacter(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{
	if (!HasAnyFlags(RF_TagGarbageTemp))
	{
		ObjectInitializer.SetDefaultSubobjectClass<UMyProjectCharacterMovementComponent>(ACharacter::CharacterMovementComponentName);
	}
...

```

Version 1 error

```auto

Unknown exception - code 00000001 (first/second chance not available)

Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 1639] 
Object is not packaged: None None

KERNELBASE + 37901 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FMsg::Logf__VA() + 463 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:526]
UE4Editor_CoreUObject!StaticAllocateObjectErrorTests() + 941 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1639]
UE4Editor_CoreUObject!StaticAllocateObject() + 197 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1688]
UE4Editor_CoreUObject!UClass::CreateDefaultObject() + 319 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:2502]
UE4Editor_CoreUObject!FObjectInitializer::CreateDefaultSubobject() + 569 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:2644]
UE4Editor_CoreUObject!UObject::CreateDefaultSubobject() + 419 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\obj.cpp:62]
UE4Editor_Engine!ACharacter::ACharacter() + 888 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\character.cpp:77]

```

Version 2 error

```auto

Unknown exception - code 00000001 (first/second chance not available)

Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 2193] 
MyProjectCharacter //Engine//Transient.Default__MyProjectCharacter.CharMoveComp: Subobject cl

KERNELBASE + 37901 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FMsg::Logf__VA() + 463 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:526]
UE4Editor_CoreUObject!FObjectInitializer::AssertIfSubobjectSetupIsNotAllowed() + 209 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:2193]
UE4Editor_MyProject_3347_Win64_DebugGame!FObjectInitializer::SetDefaultSubobjectClass<UMyProjectCharacterMovementComponent>() + 178 bytes [e:\unreal engine\epic games\4.7\engine\source\runtime\coreuobject\public\uobject\uobjectglobals.h:731]
UE4Editor_MyProject_3347_Win64_DebugGame!AMyProjectCharacter::AMyProjectCharacter() + 233 bytes [e:\unreal projects\game1\myproject\source\myproject\myprojectcharacter.cpp:17]

```

Version 3 error

```auto

Unknown exception - code 00000001 (first/second chance not available)

Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 1639] 
Object is not packaged: None None

KERNELBASE + 37901 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FMsg::Logf__VA() + 463 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:526]
UE4Editor_CoreUObject!StaticAllocateObjectErrorTests() + 941 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1639]
UE4Editor_CoreUObject!StaticAllocateObject() + 197 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1688]
UE4Editor_CoreUObject!UClass::CreateDefaultObject() + 319 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:2502]
UE4Editor_CoreUObject!FObjectInitializer::CreateDefaultSubobject() + 569 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:2644]
UE4Editor_MyProject_917_Win64_DebugGame!AMyProjectCharacter::AMyProjectCharacter() + 364 bytes [e:\unreal projects\game1\myproject\source\myproject\myprojectcharacter.cpp:17]

```

---

<div class="post-metadata">

**Author:** ![maikklein](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/maikklein/32/918666_2.png) [@maikklein](https://forums.unrealengine.com/u/maikklein)\
**Post date:** [March 19, 2015, 3:21pm UTC](https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748/2 "2015-03-19T15:21:31Z")

</div>

Just start your game in debug mode and look at the line where it throws.

=\> Hit F5 in Visual Studio for debugging.

---

<div class="post-metadata">

**Author:** ![Sharsnik](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sharsnik](https://forums.unrealengine.com/u/Sharsnik)\
**Post date:** [March 19, 2015, 9:30pm UTC](https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748/3 "2015-03-19T21:30:23Z")

</div>

It crashes during hotload , when it tries to initialize the custom CharacterMovementComponent.

---

<div class="post-metadata">

**Author:** ![anonymous\_user\_4fe9f58b1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_4fe9f58b1](https://forums.unrealengine.com/u/anonymous_user_4fe9f58b1)\
**Post date:** [March 19, 2015, 9:59pm UTC](https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748/4 "2015-03-19T21:59:43Z")

</div>

Overriding base class default subobjects is a bit special due to the nature of C++ constructors. C++ constructs objects starting from the basemost class and works its way up to the top. So when you are inside the AMyProjectCharacter::AMyProjectCharacter(const FObjectInitializer& ObjectInitializer) constructor proper, ACharacter has already been constructed and it is too late to override the default subobject.

Therefore, the syntax to override or disable base class subobjects has to be passed down to the base class through the Super constructor. This is why SetDefaultSubobjectClass returns a FObjectInitializer reference, so you can modify it before passing it to the base class. Here’s how you would do it:

```auto

AMyProjectCharacter::AMyProjectCharacter(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer.SetDefaultSubobjectClass<UMyProjectCharacterMovementComponent>(ACharacter::CharacterMovementComponentName)
{
	// ctor body
}

```

-

---

<div class="post-metadata">

**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:** [March 19, 2015, 10:21pm UTC](https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748/5 "2015-03-19T22:21:19Z")

</div>

is correct!

For others, and for future reference, I made a wiki on this subject a while back here:

**Wiki: Custom Character Movement Component**

> **[A new, community-hosted Unreal Engine Wiki](https://forums.unrealengine.com/t/a-new-community-hosted-unreal-engine-wiki/141494)**
>
> After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — https://unrealcommunity.wiki/! You will be able to find content from...

```auto

**Note On Subclassing / Blueprinting C++ Class**

Be careful when subclassing a C++ class that uses this structure, **you can't change the custom movement component later** without having blueprinted versions of this class completely freak out.

Since you usually blueprint character C++ classes, this is an important precaution to remember!

Rama
```

---

<div class="post-metadata">

**Author:** ![Sharsnik](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Sharsnik](https://forums.unrealengine.com/u/Sharsnik)\
**Post date:** [March 20, 2015, 12:11am UTC](https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748/6 "2015-03-20T00:11:18Z")

</div>

Thanks for the answers. Yeah, you’ll see that I attempted to use that method of initialization in Version 1 of my code (Versions 2 and 3 are different approaches). The crash is also listed in the opening post (Under Version 1).

Rama, is this then the issue you referred to when you said “without having blueprinted versions of this class completely freak out.”?

How do I fix this then? Do I need to recreate the blueprint of the character?

Edit: The error seems to persist even after I deleted all blueprints of the original class from the project.

Edit2: To avoid confusion, here’s the code and the error again:

MyProjectCharacter.cpp

```auto

AMyProjectCharacter::AMyProjectCharacter(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer.SetDefaultSubobjectClass<UMyProjectCharacterMovementComponent>(ACharacter::CharacterMovementComponentName))
{

```

Error

```auto

Unknown exception - code 00000001 (first/second chance not available)

Fatal error: [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 1644] 
Object is not packaged: None None

KERNELBASE + 37901 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FMsg::Logf__VA() + 463 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:526]
UE4Editor_CoreUObject!StaticAllocateObjectErrorTests() + 941 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1644]
UE4Editor_CoreUObject!StaticAllocateObject() + 197 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1693]
UE4Editor_CoreUObject!UClass::CreateDefaultObject() + 319 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:2502]
UE4Editor_CoreUObject!FObjectInitializer::CreateDefaultSubobject() + 569 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:2649]
UE4Editor_CoreUObject!UObject::CreateDefaultSubobject() + 419 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\obj.cpp:62]
UE4Editor_Engine!ACharacter::ACharacter() + 888 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\character.cpp:77]
UE4Editor_MyProject_3972_Win64_DebugGame!AMyProjectCharacter::AMyProjectCharacter() + 117 bytes [e:\unreal projects\game1\myproject\source\myproject\myprojectcharacter.cpp:10]
UE4Editor_MyProject_3972_Win64_DebugGame!AMyProjectCharacter::__DefaultConstructor() + 76 bytes [e:\unreal projects\game1\myproject\source\myproject\myprojectcharacter.h:9]
UE4Editor_MyProject_3972_Win64_DebugGame!InternalConstructor<AMyProjectCharacter>() + 40 bytes [e:\unreal engine\epic games\4.7\engine\source\runtime\coreuobject\public\uobject\class.h:2238]
UE4Editor_CoreUObject!StaticConstructObject() + 1444 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:2237]
UE4Editor_CoreUObject!UClass::HotReloadPrivateStaticClass() + 397 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:3368]
UE4Editor_MyProject_3972_Win64_DebugGame!GetPrivateStaticClassBody<AMyProjectCharacter>() + 526 bytes [e:\unreal engine\epic games\4.7\engine\source\runtime\coreuobject\public\uobject\class.h:2279]
UE4Editor_MyProject_3972_Win64_DebugGame!AMyProjectCharacter::GetPrivateStaticClass() + 78 bytes [e:\unreal projects\game1\myproject\intermediate\build\win64\inc\myproject\myproject.generated.cpp:50]
UE4Editor_MyProject_3972_Win64_DebugGame!TClassCompiledInDefer<AMyProjectCharacter>::Register() + 42 bytes [e:\unreal engine\epic games\4.7\engine\source\runtime\coreuobject\public\uobject\uobjectbase.h:296]
UE4Editor_CoreUObject!UClassRegisterAllCompiledInClasses() + 176 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:690]
UE4Editor_CoreUObject!ProcessNewlyLoadedUObjects() + 11 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:808]
UE4Editor_CoreUObject!TBaseStaticDelegateInstance<void __cdecl(void)>::ExecuteIfSafe() + 7 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:921]
UE4Editor_Core!TBaseMulticastDelegate<void>::Broadcast() + 149 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:1030]
UE4Editor_Core!FModuleManager::LoadModuleWithFailureReason() + 2194 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\modules\modulemanager.cpp:359]
UE4Editor_Core!FModuleManager::LoadModule() + 56 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\modules\modulemanager.cpp:238]
UE4Editor_HotReload!FHotReloadModule::DoHotReloadInternal() + 648 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\developer\hotreload\private\hotreload.cpp:654]
UE4Editor_HotReload!FHotReloadModule::DoHotReloadFromIDE() + 1660 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\developer\hotreload\private\hotreload.cpp:1059]
UE4Editor_HotReload!FHotReloadModule::Tick() + 112 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\developer\hotreload\private\hotreload.cpp:995]
UE4Editor!FTicker::Tick() + 698 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\containers	icker.h:90]
UE4Editor!FEngineLoop::Tick() + 6356 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2352]
UE4Editor!GuardedMain() + 1404 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

```

I moved this issue to the AnswerHub (It’s probably more appropriate there).

---

<div class="post-metadata">

**Author:** ![anonymous\_user\_4fe9f58b1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_4fe9f58b1](https://forums.unrealengine.com/u/anonymous_user_4fe9f58b1)\
**Post date:** [March 20, 2015, 2:21pm UTC](https://forums.unrealengine.com/t/crashes-while-using-extended-charactermovementcomponent/24748/7 "2015-03-20T14:21:24Z")

</div>

Try rebuilding outside of a hot reload? (i.e.: compile your game project without the editor running)