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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]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.

Product Version: UE 4.12
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asked Aug 24 '16 at 09:51 AM in Bug Reports

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avatar image Adam Davis STAFF Aug 26 '16 at 01:51 PM

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.

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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.

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answered Aug 29 '16 at 03:05 PM

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