Editor crashes on startup at 95% after installing large numbers of asset packs

My game was coming along very nicely, but then I tried adding about 20 asset packs all at once, now when i try to start up my game it crashes to desktop after it loads up to 95%.

I always get either one of two errors:

LoginId: [id witheld]
EpicAccountId:

Assertion failed: false [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Engine/Private/EdGraph/EdGraphPin.cpp] [Line: 1884] Pin named ReturnValue was serialized while trashed - requesting pin named BuildingType owned by node K2Node_VariableGet_0

UE4Editor_Core
UE4Editor_Core
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_BlueprintGraph
UE4Editor_BlueprintGraph
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_BlueprintGraph
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_BlueprintGraph
UE4Editor_BlueprintGraph
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_BlueprintGraph
UE4Editor_BlueprintGraph
UE4Editor_BlueprintGraph
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_BlueprintGraph
UE4Editor_BlueprintGraph
UE4Editor_BlueprintGraph
UE4Editor_Engine
UE4Editor_Core
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Core
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Core
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Core
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_DetailCustomizations
UE4Editor_DetailCustomizations
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_PropertyEditor
UE4Editor_LevelEditor
UE4Editor_LevelEditor
UE4Editor_LevelEditor
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_LevelEditor
UE4Editor_LevelEditor
UE4Editor_LevelEditor
UE4Editor_LevelEditor
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_MainFrame
UE4Editor_UnrealEd
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll

or if it’s not that, it’s this:

LoginId: [id witheld]
EpicAccountId:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff

UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_BlueprintGraph
UE4Editor_BlueprintGraph
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll

I also noticed that my epic account ID is missing in both cases…

Is there any way to save my game? I have a backup but I’d lose a lot of important work.

Hello,

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Thanks,