Engine TRASHCLASS

Hello there,

I’m getting a lot of those:

[2016.08.24-09.38.48:477][102]BlueprintLog: New page: Compile SceneGameMode
[2016.08.24-09.39.01:738][320]LogWindows: Windows GetLastError: L’opération a réussi. (0)
[2016.08.24-09.39.02:054][320]LogCrashTracker: 
[2016.08.24-09.39.02:054][320]LogCrashTracker: 
[2016.08.24-09.39.02:054][320]LogWindows:Error: === Critical error: ===
Fatal error: [File:D:\Build\++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 148] 
UBlueprintGeneratedClass::GetAuthoritativeClass: ClassGeneratedBy is null. class '/Engine/Transient.TRASHCLASS_BubbleWidget_87'
[2016.08.24-09.39.02:084][320]LogExit: Executing StaticShutdownAfterError

The problem is that BubbleWidget is an old BP class that isn’t in our project since a long time. It crashes randomly, sometime when compiling classes (which didn’t have any connection with this old BP), sometimes when drawing connections between nodes within a BP, sometimes at project loading. We tried on Mac and Windows: same problem.

Already tried to delete the Intermediate and Saved folders but no positive results. Even try to build a project from scratch (migrating the BPs) but no more luck.

Version: 4.12.5-3039270
Systems: Windows 10 + Mac OS Sierra

Thanks for your precious help.

Hi bricefr,

TRASHCLASS errors often occur as a result of NULL pointers. Run “Fix Up Redirectors” on the Contents folder, additionally check your blueprints to ensure that you aren’t passing any NULL values into any blueprints.

Hi bricefr,

We have not heard from you in several days. I am marking this as answered for tracking purposes. If you are still experiencing this error, please try the solutions listed above and respond here with updated information.