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Ensure condition failed: bFoundCell

Hi, I’ve been working on a project and suddenly started getting the following error when trying to package for windows which I have not been able to resolve. It seems to be related to World Partition, but beyond that when cooking fails I am not getting any indication of how to fix it.

Any help would be greatly appreciated.

Cook-2021.09.20-05.01.23.txt (219.4 KB)

UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: begin: stack for UAT
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: === Handled ensure: ===
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error:
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: Ensure condition failed: bFoundCell [File:D:/build/++UE5/Sync/Engine/Source/Runtime/Engine/Private/WorldPartition/RuntimeSpatialHash/RuntimeSpatialHashGridHelper.cpp] [Line: 216]
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: Stack:
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00007fffd211f787 UnrealEditor-Engine.dll!UnknownFunction []
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00007fffcedd808b UnrealEditor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00007ff6ca79910e UnrealEditor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00007ff8343e7034 KERNEL32.DLL!UnknownFunction []
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: [Callstack] 0x00007ff836282651 ntdll.dll!UnknownFunction []
UATHelper: Packaging (Windows):   LogInit: Display: LogOutputDevice: Error: end: stack for UAT

Found a solution, but it requires rebuilding the entire level. Turns out that when this occurs some data in Content/ExternalActors/ExampleLevel has been corrupted, and I had to delete the folder for the level in explorer. I’m able to package now, but did not find a way to fix this without having to rebuild my level, so be aware. I believe this occured when I crashed while moving files, so be careful as World Partition has some issues like this.