Crashing after converting to 4.12

Hey guys,

We have been having a problem with one of our project once its converted to 4.12, the project works fine in 4.10 and 4.11 with no modifications. But when we convert it to 4.12 the editor crashes on lunch, this also happens when we migrate the files to an existing 4.12 project. This is a blueprint project.

The critical problem in the crash log is this:

[2016.06.21-13.55.05:347][626]LogWindows:Error: === Critical error: ===
Assertion failed: !HasAnyFlags(RF_NeedLoad|RF_NeedPostLoad) [File:D:\Build++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectLinker.cpp] [Line: 102]
Detaching from existing linker for D:/OneDrive/Defuse Studios/Products/UE4/RTS_Building_Template_X 4.12/Content/RTS_Builder_Template/Blueprints/BuildingActors/BP_MasterBuilding2.uasset while object ObjectProperty /Engine/Transient.TRASHCLASS_BP_MasterBuilding2_34:ObjectProperty_108 needs loaded

Any help would be appropriated.


Work around here: Editor Crash on Startup (Asseration Failed:UOBJECT) - Blueprint - Unreal Engine Forums


Same issue here

And here as well : Editor Crash on Startup (Asseration Failed:UOBJECT) - Blueprint - Unreal Engine Forums

Wish they would at least recognize the problem… It’s been weeks now…

To Repo this issue : Check Marketplace asset GenericShooter, it is affected by the same bug.

Hi Defuse Studios,

As I stated in Burnz’s post, I have entered a bug report, UE-32356, to be assessed by the development staff. If you need additional information, please post on Burnz’s answerhub link so we can keep the information in one location.

Hey guys,

For reference a work around has been found here: