Lol, I had this same error a little while ago. My map has some music in it, so an error message pops up. Just some error at such and such a location and unable to save. Of course I go "oh crap!" cuz SF doesn't auto-save and I'm thinking I just lost like 3 hours of work. So I grumble a bit and open up the map in X-Tra where I thought I had been 3 hours ago. The funny thing was all the stuff was saved from where I "attempted" to save it just recently. The same error kept on popping up every time I saved it in X-Tra, but the stuff kept on saving (thank god). SCM Draft 2 had no error messages, and when I opened the map up again in SF some weird symbol error message popped up but didn't hinder me in the least. Next thing I know, it's like a toggling effect. Every other time I use SF it brings up these stupid and meaningless error messages. Annoying but thankfully harmless.