Need help with the "Paint Tool" (Garry´s Mod crashes when using it)

EDIT: It was an error with the model. uhm… How can I delete this thread?

I have no idea what I did wrong. I also didn’t knew Gmod will crash by just using some paint.
Here´s a picture:

http://filesmelt.com/dl/wtf2.JPG

Sorry if it is way to big.