Editor crash on Play If Blueprint is not recompiled every launch

anonymous_user_9b155d6f · March 24, 2015, 5:18am

Hello,

We are having an issue where one of our NPC’s are causing a crash. After some debugging we realised every time that we opened up the project, if we did not open up the Blueprint of the NPC and recompile it without changing anything, the editor would crash with the following error:

*> MachineId:C879FE7244FF690B3E59F79A254CE0CD

EpicAccountId:836dbd1febcb45009669ac7dd7a4f948

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

Assertion failed: ((UObject*)ContainerPtr)->IsA((UClass*)GetOuter() [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\CoreUObject\Public\UObject\UnrealType.h] [Line: 357] ‘3rdSpiderPawn_44’ is of class '3rdSpiderPa

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!FOutputDevice::Logf__VA()

248 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor_Core!FDebug::AssertFailed()

1079 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:224]
UE4Editor_CoreUObject!UObject::execInstanceVariable()

488 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:975]
UE4Editor_Engine!UKismetMathLibrary::execLessEqual_IntInt()

51 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\classes\kismet\kismetmathlibrary.h:61]
UE4Editor_CoreUObject!UFunction::Invoke()

180 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:3684]
UE4Editor_CoreUObject!UObject::CallFunction()

1112 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:395]
UE4Editor_CoreUObject!UObject::ProcessContextOpcode()

141 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1451]
UE4Editor_CoreUObject!UObject::execLetBool()

334 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1370]
UE4Editor_CoreUObject!UObject::ProcessInternal()

1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UObject::CallFunction()

2707 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:516]
UE4Editor_CoreUObject!UObject::ProcessInternal()

1644 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:602]
UE4Editor_CoreUObject!UFunction::Invoke()

180 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:3684]
UE4Editor_CoreUObject!UObject::ProcessEvent()

3036 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:924]
UE4Editor_Engine!AActor::ProcessEvent()

259 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\actor.cpp:529]
UE4Editor_Engine!AActor::ReceiveTick()

74 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\intermediate\build\win64\inc\engine\engine.generated.1.cpp:1121]
UE4Editor_Engine!AActor::Tick() + 121
bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\actor.cpp:672]
UE4Editor_Engine!APawn::Tick() + 14
bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\pawn.cpp:712]
UE4Editor_Engine!AActor::TickActor() +
78 bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\actor.cpp:660]
UE4Editor_Engine!FActorTickFunction::ExecuteTick()

580 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\actor.cpp:119]
UE4Editor_Engine!FTickTaskSequencer::FTickFunctionTask::DoTask()

214 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\ticktaskmanager.cpp:322]
UE4Editor_Engine!TGraphTask::ExecuteTask()

445 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\async\taskgraphinterfaces.h:671]
UE4Editor_Core!FTaskThread::ProcessTasks()

3125 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\async\taskgraph.cpp:428]
UE4Editor_Core!FTaskThread::ProcessTasksUntilQuit()

77 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\async\taskgraph.cpp:271]
UE4Editor_Core!FTaskGraphImplementation::WaitUntilTasksComplete()

511 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\async\taskgraph.cpp:984]
UE4Editor_Engine!FTaskGraphInterface::WaitUntilTaskCompletes()

367 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\async\taskgraphinterfaces.h:188]
UE4Editor_Engine!FTickTaskSequencer::ReleaseTickGroup()

432 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\ticktaskmanager.cpp:187]
UE4Editor_Engine!FTickTaskManager::RunTickGroup()

1182 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\ticktaskmanager.cpp:722]
UE4Editor_Engine!UWorld::RunTickGroup()

102 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\leveltick.cpp:696]
UE4Editor_Engine!UWorld::Tick() + 2971
bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\leveltick.cpp:1114]
UE4Editor_UnrealEd!UEditorEngine::Tick()

5618 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\editor.cpp:1329]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick()

22 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\unrealedengine.cpp:347]
UE4Editor!FEngineLoop::Tick() + 4179
bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2257]
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]*

We take it this is a problem with the order in which the instances of our NPC’s are created but we are unsure on why and how to fix it.

anonymous_user_b9532c9a · March 24, 2015, 5:54pm

Can you post your crash log here? You can find this at \Unreal Projects\PROJECTNAME\saved\logs.

anonymous_user_9b155d6f · March 24, 2015, 10:39pm

link text

anonymous_user_9b155d6f · March 24, 2015, 11:07pm

Update on the issue: We thought we had fixed it. We just re-parented it to character and then back to base enemy and it ran fine. But when we tried to access the health variable in ‘Event Tick’ for the base enemy we got the crash again. It says "Variable not in scope’ but it is a local variable. Re-compiling the blueprint still fixes it, but we have to do it every time we open the project.

anonymous_user_b9532c9a · March 25, 2015, 3:38pm

Can you show me a screenshot of your blueprint, specifically 3rdSpiderPawn. It seems the Spider pawn is trying to access a property that belongs to BaseEnemy, but Spiderpawn is not registering as a child of BaseEnemy. If I can see what is going on with the health variable I might get a better idea of what is occurring.

anonymous_user_9b155d6f · March 26, 2015, 12:34am

There is alot of information in 3rdSpiderPawn, do you want anything specifically or just the entire blueprint?

anonymous_user_b9532c9a · March 26, 2015, 2:46pm

For now, lets stick with what information is accessing the BaseEnemy variable, if I can’t see what is going on from there we can see what else is needed.

anonymous_user_b9532c9a · March 30, 2015, 3:17pm

Hi ,

We have not heard from you in several days. I am marking this thread as answered for tracking purposes. If you are still experiencing this error, please comment with the requested information.

anonymous_user_9b155d6f · March 30, 2015, 10:45pm

Sorry i havnt been at the office in a few days. Here is a SS of where we are using the varialble. Its in ‘Event Tick’.

anonymous_user_b9532c9a · March 31, 2015, 4:07pm

If you open the “Class Settings” on your spider, what is the “Parent Class” set to?

anonymous_user_9b155d6f · April 1, 2015, 12:00am

Base Enemy. Also we have fixed the issue by just putting all the things to do with health in the base enemy class.

If you are still able to help us determine why it was crashing it would be nice, for curiosity’s sake. If not that is fine

anonymous_user_b9532c9a · April 1, 2015, 5:37pm

In your BaseEnemy class, is the Health variable set to editable?

anonymous_user_9b155d6f · April 2, 2015, 10:04pm

Yep it is.

anonymous_user_b9532c9a · April 6, 2015, 5:37pm

What event dispatchers are you using? I just noticed that you have two dropdown menus for them in your pawn. Do any of these affect the health variable?

anonymous_user_9b155d6f · April 11, 2015, 1:33am

I dont have the project on me but from memory neither are using the health variable.

anonymous_user_b9532c9a · April 13, 2015, 3:14pm

Do you have a copy of the project that is still crashing? I’d be happy to take a look and see what is occurring so we can get a bug report in for the crash. This could help other users who may be experiencing the same type of crash.

anonymous_user_9b155d6f · April 14, 2015, 2:08am

Yes i do, how would you like it?

anonymous_user_b9532c9a · April 14, 2015, 2:17pm

If small enough you can post a . here, if not you can upload it to a trusted FTP server and send me a link either here or in a PM on the forums.

anonymous_user_9b155d6f · April 15, 2015, 12:58am

I just private messaged you on the forums with the link.

anonymous_user_b9532c9a · April 15, 2015, 6:21pm

Hi ,

While I was able to reproduce the crash, I could not discover the cause. I have entered a bug report, UE-13859 to be assessed by the development staff. I noticed that in almost all of your blueprints that I looked at you had objects casting to themselves. For instance, 3rdSpiderPawn casts to 3rdSpiderPawn several times. This is unnecessary and can cause errors other than the crash you are experiencing. I tested without these casts and it seems that the functionality you had worked without the casts, so I highly recommend removing them.