Cannot save level?

Hi everyone. I’m using Unreal for a big assignment atm, and I’ve almost finished the level I’m making but have just run into a big problem. Every time I now move anything in my level, or make any change to my game full stop, I am getting an error saying it failed to save. Pictures above ^. I really have no idea what caused this as it’s been fine up till now, but any help fixing this ASAP would be much appreciated!

Were you able to solve this issue? I’m running into the same problem. Thanks!