TRASHCLASS compile errors when overriding custom events

On 4.11 P4.
“Error This blueprint (self) is not a TRASHCLASS_Piece_224, therefore ’ Target ’ must have a connection.”.
Error appears after modify parent class, and recompile his children.
After restart editor, all files compile successful.

Sometimes, on compile, editors crashing. Log:

[2016.02.06-11.50.20:045][468]BlueprintLog: New page: Compile Piece
Fatal error: [File:/Users/build/BuildFarm/build_++UE4+Release-4.11/Engine/Source/Runtime/Engine/Private/BlueprintGeneratedClass.cpp] [Line: 131] 
UBlueprintGeneratedClass::GetAuthoritativeClass: ClassGeneratedBy is null. class '/Engine/Transient.TRASHCLASS_Piece_224'

Traceback: [link text][1]

Some variables:

77559-screen+shot+2016-02-06+at+1.56.23+pm.png