UE4 crashes when hitting play or blueprint button

Development Programming & Scripting Blueprint
, , , , ,
1

Hey Guys,

UE4 keeps crashing for some reason. As far as I know I wasn’t doing anything special and all of the sudden UE4 crashes when I pressed the play button. Now I pretty much can’t edit or click on anything. Below my crash report.

MachineId:66EDF080430B6137EE5489B52441A991

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

Assertion failed: Component [File:D:\UnrealEngine-4.7\Engine\Source\Runtime\Engine\Private\Blueprint.cpp] [Line: 1122]

KERNELBASE + 35740 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 285 bytes [d:\unrealengine-4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FOutputDevice::Logf__VA() + 248 bytes [d:\unrealengine-4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor_Core!FDebug::AssertFailed() + 1079 bytes [d:\unrealengine-4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:224]
UE4Editor_Engine!UBlueprint::ChangeOwnerOfTemplates() + 426 bytes [d:\unrealengine-4.7\engine\source\runtime\engine\private\blueprint.cpp:1123]
UE4Editor_Engine!UBlueprint::PostLoadSubobjects() + 23 bytes [d:\unrealengine-4.7\engine\source\runtime\engine\private\blueprint.cpp:1222]
UE4Editor_CoreUObject!UObject::ConditionalPostLoadSubobjects() + 61 bytes [d:\unrealengine-4.7\engine\source\runtime\coreuobject\private\uobject\obj.cpp:717]
UE4Editor_CoreUObject!UObject::ConditionalPostLoad() + 446 bytes [d:\unrealengine-4.7\engine\source\runtime\coreuobject\private\uobject\obj.cpp:625]
UE4Editor_CoreUObject!EndLoad() + 1724 bytes [d:\unrealengine-4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1126]
UE4Editor_CoreUObject!LoadPackageInternal() + 2248 bytes [d:\unrealengine-4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:906]
UE4Editor_CoreUObject!ResolveName() + 1483 bytes [d:\unrealengine-4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:610]
UE4Editor_CoreUObject!StaticLoadObject() + 655 bytes [d:\unrealengine-4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:697]
UE4Editor_CoreUObject!StaticLoadClass() + 167 bytes [d:\unrealengine-4.7\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:760]
UE4Editor_Engine!UWorld::SetGameMode() + 2240 bytes [d:\unrealengine-4.7\engine\source\runtime\engine\private\world.cpp:2754]
UE4Editor_Engine!UGameInstance::StartPIEGameInstance() + 930 bytes [d:\unrealengine-4.7\engine\source\runtime\engine\private\gameinstance.cpp:179]
UE4Editor_UnrealEd!UEditorEngine::CreatePIEGameInstance() + 8708 bytes [d:\unrealengine-4.7\engine\source\editor\unrealed\private\playlevel.cpp:2861]
UE4Editor_UnrealEd!UEditorEngine::PlayInEditor() + 7184 bytes [d:\unrealengine-4.7\engine\source\editor\unrealed\private\playlevel.cpp:2212]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlayMapRequest() + 643 bytes [d:\unrealengine-4.7\engine\source\editor\unrealed\private\playlevel.cpp:974]
UE4Editor_UnrealEd!UEditorEngine::Tick() + 3604 bytes [d:\unrealengine-4.7\engine\source\editor\unrealed\private\editor.cpp:1226]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() + 22 bytes [d:\unrealengine-4.7\engine\source\editor\unrealed\private\unrealedengine.cpp:347]
UE4Editor!FEngineLoop::Tick() + 4179 bytes [d:\unrealengine-4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2257]
UE4Editor!GuardedMain() + 1404 bytes [d:\unrealengine-4.7\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\unrealengine-4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\unrealengine-4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

Anyone an idea how to solve this?

Thanks!

2

Hey Sjors,

Are you having this problem with only one of your projects? If so, have you tried deleting the saved, config and intermediate folders that are within the project folder? Do you have any back up of your project that you’d be able to revert to, it’s possible that something you changed within the blueprints caused this crash. Do you remember what you were doing exactly?

Looking forward to hearing from you, thanks!

3

Hello ,

I did not try it, however I may try in the future, if it happens again.
I am currently using the Official Leap Motion plugin and I’ve tweaked some things in the NoCollisideBoneActor blueprint. So after it crashed I tried to figure out which blueprint was responsible for the crash and it turned out to be that one. I think it’s bugged, because this morning UE4 crashed again (pretty much everytime I open up the project). However, if I delete the tweaked blueprint and replace it with the original one (and then tweak it again) everything works smoothly again. But it appears that there is something wrong within some of the folders like you said. The blueprint might have some troubles regarding finding the parent class or something. Anyway, thanks for the advice!

Kind regards,

Sjors Jessen