Assertion Faled NumMarks in MemStack.h

Development Platform & Builds XR Development
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1

When trying to play in VR, and only in VR using HTC Vive I get an error after some period of time. This happens both in PIE and packaged game.

[2018.03.13-22.13.32:266][ 22]LogWindows: Windows GetLastError: Operacja ukończona pomyślnie. (0)
[2018.03.13-22.13.32:631][ 22]LogWindows: Windows GetLastError: Operacja ukończona pomyślnie. (0)
[2018.03.13-22.13.32:631][ 22]LogWindows: Error: === Critical error: ===
[2018.03.13-22.13.32:631][ 22]LogWindows: Error: 
[2018.03.13-22.13.32:631][ 22]LogWindows: Error: Assertion failed: (GIsCriticalError || !NumMarks) [File:D:\Build\++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Core\Public\Misc/MemStack.h] [Line: 89] 
[2018.03.13-22.13.32:631][ 22]LogWindows: Error: 
[2018.03.13-22.13.32:631][ 22]LogWindows: Error: 
[2018.03.13-22.13.32:631][ 22]LogWindows: Error: 
[2018.03.13-22.13.32:631][ 22]LogWindows: Error: 
[2018.03.13-22.13.32:646][ 22]LogExit: Executing StaticShutdownAfterError
[2018.03.13-22.13.32:653][ 22]LogWindows: FPlatformMisc::RequestExit(1)
[2018.03.13-22.13.32:653][ 22]Log file closed, 03/13/18 23:13:32

I am using level streaming but it happend even before I used it. Any help?

2

Same thing happening for me. I’m using Vive and level streaming. It could be a 4.19 issue as we didn’t have any problems before in 4.17.

3

Ok I’ve narrowed my crashes down to the MotionController component. As long as this exists in any actor present in the scene there’s a large chance of a crash when level streaming, not sure if it’s related to your issue. Would definitely be good to know whether this should be submitted as a bug.