[BUG] Unable to compile Blueprint. Assertion Failed: ChildClass->GetSuperClass() == ClassToReinstance || ChildClass->GetSuperClass() == DuplicatedClass

Development Programming & Scripting Blueprint
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1

Yesterday i compiled all my Blueprints without issues and exited the editor but today when i try to compile this Blueprint, UE4 just crashes without any error message. I faced this error two days before but was able to recover from it with a backup but now none of the backups work. I can open this Blueprint but compiling always crashes.

Engine version: 4.1.1 (Compiled source from Github)

OS: Windows 7 x64

CPU: Core i5-760

RAM: 4GB

GPU: Geforce 750-Ti

UAC enabled

This is the error:

[2014.05.27-06.02.52:014][435]BlueprintLog: New page: Compile RTS_Structure_Master
[2014.05.27-06.02.54:135][435]LogWindows:Error: appError called: Assertion failed: ChildClass->GetSuperClass() == ClassToReinstance || ChildClass->GetSuperClass() == DuplicatedClass [File:D:\__DEPOT__\UnrealEngine\Engine\Source\Editor\UnrealEd\Private\Kismet2\KismetReinstanceUtilities.cpp] [Line: 506]

Stack:
FWindowsPlatformStackWalk::StackWalkAndDump() 0xeb304366 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:177] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Core.dll]
FDebug::AssertFailed() 0xeb1a2795 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\private\misc\outputdevice.cpp:176] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Core.dll]
FBlueprintCompileReinstancer::ReparentChild() 0xe7884ea4 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:508] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FBlueprintCompileReinstancer::ReparentChild() 0xe7884e02 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:497] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FBlueprintCompileReinstancer::FBlueprintCompileReinstancer() 0xe784d521 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:78] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FKismetEditorUtilities::CompileBlueprint() 0xe786645c + 18 bytes [File=d:\__depot__\unrealengine\engine\source\editor\unrealed\private\kismet2\kismet2.cpp:321] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FBlueprintEditor::Compile() 0xe516e1a0 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\editor\kismet\private\blueprinteditor.cpp:2212] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Kismet.dll]
TBaseSPMethodDelegateInstance_NoParams<FBlueprintEditor,void,0>::Execute() 0xe51a6ecd + 12 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\public\templates\delegateinstancesimpl.inl:223] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Kismet.dll]
TBaseSPMethodDelegateInstance_NoParams<FBlueprintEditor,void,0>::ExecuteIfSafe() 0xe51abfa7 + 9 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\public\templates\delegateinstancesimpl.inl:250] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Kismet.dll]
FUICommandList::ExecuteAction() 0xe80f02e0 + 60 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\inputbinding.cpp:780] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
SToolBarButtonBlock::OnClicked() 0xe84016dd + 0 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\multibox\stoolbarbuttonblock.cpp:293] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
TBaseSPMethodDelegateInstance_RetVal_NoParams<SToolBarButtonBlock,FReply,0>::Execute() 0xe83d061c + 17 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\public\templates\delegateinstancesimpl.inl:223] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
TBaseDelegate_RetVal_NoParams<FReply>::Execute() 0xe80efdfa + 20 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\public\templates\delegatesignatureimpl.inl:996] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
SButton::OnMouseButtonUp() 0xe810df65 + 17 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\sbutton.cpp:185] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
FSlateApplication::ProcessMouseButtonUpMessage() 0xe81d805f + 23 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\slateapplication.cpp:3576] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
FSlateApplication::OnMouseUp() 0xe81cc239 + 16 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\slateapplication.cpp:3
[2014.05.27-06.02.54:135][435]LogWindows:Error: Windows GetLastError: The operation completed successfully. (0)
[2014.05.27-06.02.54:135][435]LogCrashTracker: 


[2014.05.27-06.02.54:281][435]LogCrashTracker: 


[2014.05.27-06.02.54:281][435]LogWindows: === Critical error: ===


[2014.05.27-06.02.54:281][435]LogWindows: Assertion failed: ChildClass->GetSuperClass() == ClassToReinstance || ChildClass->GetSuperClass() == DuplicatedClass [File:D:\__DEPOT__\UnrealEngine\Engine\Source\Editor\UnrealEd\Private\Kismet2\KismetReinstanceUtilities.cpp] [Line: 506]

Stack:
FWindowsPlatformStackWalk::StackWalkAndDump() 0xeb304366 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\private\windows\windowsplatformstackwalk.cpp:177] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Core.dll]
FDebug::AssertFailed() 0xeb1a2795 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\private\misc\outputdevice.cpp:176] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Core.dll]
FBlueprintCompileReinstancer::ReparentChild() 0xe7884ea4 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:508] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FBlueprintCompileReinstancer::ReparentChild() 0xe7884e02 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:497] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FBlueprintCompileReinstancer::FBlueprintCompileReinstancer() 0xe784d521 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:78] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FKismetEditorUtilities::CompileBlueprint() 0xe786645c + 18 bytes [File=d:\__depot__\unrealengine\engine\source\editor\unrealed\private\kismet2\kismet2.cpp:321] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-UnrealEd.dll]
FBlueprintEditor::Compile() 0xe516e1a0 + 0 bytes [File=d:\__depot__\unrealengine\engine\source\editor\kismet\private\blueprinteditor.cpp:2212] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Kismet.dll]
TBaseSPMethodDelegateInstance_NoParams<FBlueprintEditor,void,0>::Execute() 0xe51a6ecd + 12 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\public\templates\delegateinstancesimpl.inl:223] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Kismet.dll]
TBaseSPMethodDelegateInstance_NoParams<FBlueprintEditor,void,0>::ExecuteIfSafe() 0xe51abfa7 + 9 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\public\templates\delegateinstancesimpl.inl:250] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Kismet.dll]
FUICommandList::ExecuteAction() 0xe80f02e0 + 60 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\inputbinding.cpp:780] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
SToolBarButtonBlock::OnClicked() 0xe84016dd + 0 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\multibox\stoolbarbuttonblock.cpp:293] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
TBaseSPMethodDelegateInstance_RetVal_NoParams<SToolBarButtonBlock,FReply,0>::Execute() 0xe83d061c + 17 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\public\templates\delegateinstancesimpl.inl:223] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
TBaseDelegate_RetVal_NoParams<FReply>::Execute() 0xe80efdfa + 20 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\core\public\templates\delegatesignatureimpl.inl:996] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
SButton::OnMouseButtonUp() 0xe810df65 + 17 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\sbutton.cpp:185] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
FSlateApplication::ProcessMouseButtonUpMessage() 0xe81d805f + 23 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\slateapplication.cpp:3576] [in D:\__DEPOT__\UnrealEngine\Engine\Binaries\Win64\UE4Editor-Slate.dll]
FSlateApplication::OnMouseUp() 0xe81cc239 + 16 bytes [File=d:\__depot__\unrealengine\engine\source\runtime\slate\private\slateapplication.cpp:3


[2014.05.27-06.02.54:282][435]LogExit: Executing StaticShutdownAfterError
[2014.05.27-06.02.54:298][435]LogWindows: FPlatformMisc::RequestExit(1)
[2014.05.27-06.02.54:298][435]Log file closed, 05/27/14 11:32:54

I have attached the complete log + asset with this post.

Download Log and Asset

2

I also have this crash quite regularly. In my case it seems to be related to Blueprint inheritance. If I follow this procedure when changing the base BP the crash doesn’t happen:

  • Open up the base and all child BP in tabs
  • Force recompile each child BP
  • Force recompile the base BP
3

Nice find Clapfoot. I can confirm he is right. I have to first compile all child classes inherited from RTS_Structure_Master and then i can compile it without crashing! :slight_smile:

You saved me man! :smiley: