4.7 Editor fails to start (fails to load one Blueprint)

Development Programming & Scripting Blueprint
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1

Converted our project to 4.7 earlier today and now we cant load the project anymore.

Running it under the debugger shows that it happens inside this function:

UObject* ULinkerLoad::CreateExport( int32 Index )

where the following call returns NULL for the blueprint in question:

// Find the Archetype object for the one we are loading.
UObject* Template = GetArchetypeFromRequiredInfo(LoadClass, ThisParent, Export.ObjectName, Export.ObjectFlags);

Some more info regarding the Blueprint: Its our main character bp with a lengthy inheritance chain which goes like this:

ACharacter(Engine C++)<--AAbilityUser(Custom C++)<--OOMAbilityUser(Custom BP)<--OOMCharacter(Custom BP)

Any ideas?

Thanks in advance

2

I am getting this same crash in one of my levels. It’s happening to a non-character for me. (AActor<–ATreasureDispenser<–BP_TreasureDispenser<–BP_ChoppableTree).

The debug log is also outputting “Object ‘UserConstructionScript’ isn’t imported, because its outer is a placeholder” just before the crash.

I can load the level if I first open the file in the blueprint editor (I must do this everytime)

EDIT: I have a spawner class that populates the scene with this actor in the construction script. I also can’t open this blueprint class without crashing UNLESS I first load the class that is being spawned.