Fatal crash on startup. "Could not find Superstruct..."

I started the game wondering if I had the new bug from Ch. 3. Don’t know because it fatal crashed on me and I got this.

Fatal Error:
[File:c:\B\tech_exiles\code\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoding.cpp] [Line: 3481]
Could not find SuperStructBeginPlay to create ReceiveBeginPlay

If anyone knows what might cause this, I would greatly appreciate the help.

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