Engine crash then my project won't open again

Development Platform & Builds
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1

My engine crashed and I can’t open my project. I can open other projects but not this one.
Crash report

Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/CoreUObject/Private/Templates/Casts.cpp] [Line: 10] 
Cast of LinkerPlaceholderExportObject /Game/Blueprints/Waypoints/BP_TextboxWidget.PLACEHOLDER-INST_of_PLACEHOLDER-CLASS__WidgetBlueprint_1 to Blueprint failed


0x00007ffd207d3b29 KERNELBASE.dll!UnknownFunction []
0x00007ffcc3be0216 UE4Editor-Core.dll!UnknownFunction []
0x00007ffcc3be4218 UE4Editor-Core.dll!UnknownFunction []
0x00007ffcc390242d UE4Editor-Core.dll!UnknownFunction []
0x00007ffcbfbf295a UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcb82cef90 UE4Editor-BlueprintGraph.dll!UnknownFunction []
0x00007ffcb82e5f60 UE4Editor-BlueprintGraph.dll!UnknownFunction []
0x00007ffcb821bb6e UE4Editor-BlueprintGraph.dll!UnknownFunction []
0x00007ffcb81c2bc7 UE4Editor-BlueprintGraph.dll!UnknownFunction []
0x00007ffcbe191f4d UE4Editor-UnrealEd.dll!UnknownFunction []
0x00007ffcbb7e4fed UE4Editor-Kismet.dll!UnknownFunction []
0x00007ffcbb7e2be3 UE4Editor-Kismet.dll!UnknownFunction []
0x00007ffcbfb2cc30 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdb25c1 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdd691a UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdb10ba UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdb2b1b UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdd8bbc UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfeecd66 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfda790d UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe052d2 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe038c7 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe0539d UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe038c7 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe036e1 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdbe399 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe0026a UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdb417e UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfc7a067 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfeeca33 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfda790d UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe052d2 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe038c7 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe0539d UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe038c7 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe036e1 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdbe399 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe0026a UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdb417e UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfc7a067 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfeeca33 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfda790d UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe052d2 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe038c7 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe0539d UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe038c7 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe036e1 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdbe399 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe0026a UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfdb417e UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfc7a067 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfeeca33 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfeebbc0 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbff01e1f UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbff149f5 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbff14088 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe2ecb6 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe42075 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe3df5e UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe3de0f UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe3cef3 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfaf6368 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe3bdf7 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfc0f535 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfe85d32 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfaf6368 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfddae0f UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfef16a7 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfec6478 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfbf61dd UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbff18faf UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ffcbfef5411 UE4Editor-CoreUObject.dll!UnknownFunction []
0x00007ff7e2688179 UE4Editor.exe!UnknownFunction []
0x00007ff7e2680d2c UE4Editor.exe!UnknownFunction []
0x00007ff7e26810ba UE4Editor.exe!UnknownFunction []
0x00007ff7e26840dd UE4Editor.exe!UnknownFunction []
0x00007ff7e2695984 UE4Editor.exe!UnknownFunction []
0x00007ff7e269853a UE4Editor.exe!UnknownFunction []
0x00007ffd22427c24 KERNEL32.DLL!UnknownFunction []
0x00007ffd2358d4d1 ntdll.dll!UnknownFunction []
2

Try to duplicate the project. Copy and paste anywhere. Then in this duplicate delete everything except Config, Content, .Uproject file. Go to Content/Blueprints/Waypoints and delete the BP_Textwidget. Try again. If this works, go into the old project, Saved, Autosave and copy one of the old saves of BP_Textwidget to your duplicate into the original destination Content/Blueprints/Waypoints

3

Thank you for your anwser! I thankfully managed to open the project only by deleting two asset files (BP_Textwidget and an HUD asset).

I have working backups but when I try to migrate these assets from them, the project won’t open. These backups were made and opened before the crash happened.

4

How do you try to migrate? Via copy/paste or via the Migrate function inside the project? Maybe there are dependencies which have to be migrated too.

5

Via the migrate function (there were no other dependencies for those) but anyways there other issues unfortunately (like other blueprint child components missing). I then did exactly what you said and I could reimport with copy/paste those 2 assets and have them working.

unfortunately my lighting was rebuilt and that meshed up quite some things :confused:

6

What do you mean? Can you show a comparison?