After set dressing level, getting error message "CreateModuleVersion failed: Module Validation Failed

General Issues and Bug Reporting
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1

So, I have been designing and playing my map for days, but after doing a big det dressing pass using Fortnite content, I am getting this error when I try Launching Session
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The game will then try to launch, but will fail, or leave me in a permanent pre-game room. Any ideas?

So far I have tried verifying my Unreal Engine files, but that did not fix it.

2

Same in this post:

3

Seems like it was an issue a lot of people were having, and a mod made a post about a workaround for now. I loaded up another project, launched session, and then switched back to my main project, and launched. That worked!