Fatal errors with SavePackageUtilities when packaging?

When trying to package my project, it fails, and one error line keeps coming up:

UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: Error reentered: Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/CoreUObject/Private/UObject/SavePackage/SavePackageUtilities.cpp] [Line: 533]

I have no idea what this means and I can’t find anything online either. Does anyone know what could be wrong?

Here’s the rest of the log if that helps:

As a file

As screenshots (easier to see the formatting and color-coding)

Lastly, I’m not sure if it makes a difference, but I use Jetbrains Rider to program, not Visual Studio. I don’t know if that affects how projects are packaged.

Thanks in advance for any help!

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