Editor crashes on project launch

I’m using the 4.4.1 engine on Windows, and when I attempt to launch the project I was working on yesterday I get a crash during the editor being loaded.

My project follows through the Introduction to UE4 Programming tutorial series on YouTube (stopped after the 13th video). Other 4.4.1 projects seem to open just fine.

Here’s the crash report:

!Id:eb20e9a0a110d61063e11f0000e6a4fe

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

Assertion failed: !bGenerateNonMirroredCollision || CookedDataReader.ConvexMeshes.Num() == 0 || CookedDataReader.ConvexMeshes.Num() == AggGeom.ConvexElems.Num() [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.4\Engine\Source\Runtime\Engin

KERNELBASE + 37901 bytes
UE4Editor_Core + 3095292 bytes
UE4Editor_Core + 1661738 bytes
UE4Editor_Core + 1541824 bytes
UE4Editor_Engine + 14143071 bytes
UE4Editor_Engine + 14259428 bytes
UE4Editor_CoreUObject + 899050 bytes
UE4Editor_CoreUObject + 1329894 bytes
UE4Editor_CoreUObject + 1400728 bytes
UE4Editor_UnrealEd + 2593508 bytes
UE4Editor_UnrealEd + 2540781 bytes
UE4Editor_UnrealEd + 2466449 bytes
UE4Editor_UnrealEd + 5632240 bytes
UE4Editor_UnrealEd + 2959412 bytes
UE4Editor_UnrealEd + 2958584 bytes
UE4Editor_UnrealEd + 5826192 bytes
UE4Editor_UnrealEd + 5628448 bytes
UE4Editor!GuardedMain() + 285 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launch.cpp:125]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\windows\launchwindows.cpp:125]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\windows\launchwindows.cpp:201]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

Hey schmit-

In order to investigate this crash to the best of our ability there are a few items we will need. Please provide us with the .LOG and .DMP files from your [project]\Saved\Logs folder. Additionally, you can please send us the CrashReportClient.log file located in C:\Program Files\Unreal Engine\4.0\Engine\Programs\CrashReportClient\Saved\Logs.

In addition, is it possible for you to open a different project and then load your current project once the editor is open?

Cheers

Hi , thanks for the quick response! After opening a different project successfully in the editor, reopening the project in question still seems to crash.

[LOG and DMP files][1]

I’m not able to find the crash report log. The folder doesn’t seem to exist/be generated for my 4.4 directory:

If there’s anything else I can do, please let me know.

Hey schmit-

Thanks for the information. I can let you know if more info is needed but for now we should be able to use the files you provided. I have passed this issue on to our developers for further investigation into the cause of this crash as TTP #345845.

Cheers

Hi,

Thanks for bringing this up. I’ve submitted a fix which should be in for the 4.5 release.

The problem is with some collision data getting out of sync inside an asset file. The change I’ve submitted should resolve this when you open it in the editor. If you are compiling from source you can grab my change https://github.com/EpicGames/UnrealEngine/commit/4f751f09439924b8bae86f818f12bfc3900bcbfe

If you don’t have source and don’t want to wait until 4.5 you could try narrowing down which asset is causing the problem by moving the files around, though I think this would be kind of a pain (Sorry about that!)

Hi Ori,

That’s great news, thanks for the quick turn around on this issue!