Thanks @M1racLe_Boy for the error message.
Could others share their error messages as well?
Any UnrealRevisionControl.log that contains these messages is appreciated as well. It will greatly help us investigate this issue. You can find yours in:
C:\Users\<user>\AppData\Local\UnrealEditorFortnite\Saved\Logs
(also inspect the -backup files - they are from previous editor sessions)