can't load maps

[mastfire]

When I load a map or use the editor, I get a error and the game auto quits. I am using steam. I tried uninstalling it, verifying the cache, every thing.
I don't know if I can post a pic on this forum but here it is:
http://img823.imageshack.us/img823/5334/unled21u.png (http://imageshack.us/photo/my-images/823/unled21u.png/)