I just added another sky dome. I went over it with AQT, and we both gave up on it. I guess some corrupted file had gotten into the munge, because even when I did a manual clean, and replaced the new sky file with the old one, I still got the error.
We don't know what changes you made since you haven't posted the file contents, compare any edited files with the working ones to shed light on the source of the problem.
JimmyAngler wrote:... I guess some corrupted file had gotten into the munge, because even when I did a manual clean, and replaced the new sky file with the old one, I still got the error.
A proper manual clean should clear this up, remember to delete or remove the crashing map from your addon folder too. If you still get the error after doing this then you likely have more than one problem or it wasn't what you thought it was.