UEFN crashes at 24% "Validating Local Content" with FLargeMemoryReader error

I’m having a problem with one specific UEFN project.

Every time I try to launch a session, UEFN starts “Validating Local Content” and consistently crashes at around 24%.

I get this error:

Fatal error: [File:Z:\UEVFS\Root\Engine\Source\Runtime\Core\Private\Serialization\LargeMemoryReader.cpp] [Line: 22]

Tried to initialize an FLargeMemoryReader with a null or empty buffer. Archive name: None.

I also get this warning:

Your project appears to be backed by OneDrive which may cause conflicts or unexpected behavior with other systems.

This only happens with one specific project. Other UEFN projects work correctly.

I also receive the warning:
“Your project appears to be backed by OneDrive which may cause conflicts or unexpected behavior with other systems.”

I have already tried:

  • Validate Project
  • Clearing UEFN cache