Hey.
Idk if this error is normal, but I continue to get this error
As it says WorldSettings_1, that would mean there’s two WorldSettings. When I click on it it moves to the details panel, and not the actual WorldSettings I got open.
Any idea to remove the duplicate, or is something different?
Do you also get this message when you build the default map? -> when that’s not the case, just copy all your stuff into a new map 
And how excatly do you move everything in the level over to another lvl? If I need to readd my models on the right spots manually, then this will be worthless, as I got way to many models in there.
Just select all meshes and lights in the scene outliner (right upper window in the corner) - ctrl + c - open a new map - ctrl + v 
Well it had to be a problem with the map settings, as moving to a new map worked. Thanks!