Out if of Interest:
Was the Level you tried to move the Editor Startup Map and/or Game Default Map?
(Error message:
Ensure condition failed: NavSys->Repository …
and some more related to that)
I was having the same issue with lots of errors after moving the level.
I tried to select another level as both Editor Startup Map and Game Default Map and then move it again, which to my surprise seemed to work.
I don’t know why really but it would be interesting to know if that works for others as well.
(the warning message still came, just no errors after pressing OK and restarting)