Same thing for me, the same error messages and impossible to start a session
UPDATE :
I managed to launch my project and even publish a new version.
Here are the steps I followed to make it work:
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I opened another project (one that works and launches successfully) and started a session.
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Once the session loaded (the game launched and you’re in a play session), go back to UEFN and click on “Stop the game,” then “Exit the session.”
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Then, in the game, open the menu and click on “Return to lobby.”
At this point, you are in the lobby, and the “UEFN session” tile is selected.
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Go back to UEFN, close the project, and open the project that doesn’t launch.
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In the game, start the UEFN session.
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At the same time, start a session from UEFN.
By following these steps, my project launched again, and I can reopen it and start new sessions without any issues for now. However, I still have the errors shown in the photo posted above, but at least my project launches.
If my message can help anyone 