Background is missing

[Pythoros]

So I've been working on a level for a few days now and when I went to test it this afternoon it came up with this error and would not display the background.
If you know what the issue is, then please respond.

This the error.

And here is what it looks like in game

What it looks like in the editor for reference


Edit: For some reason the issue just fixed itself.

[Emral]

post the contents of the file that the error says it cannot load. there is a mistake in it