After about 10 minutes of playing (public server or singleplayer) the game crashes

After about 10 minutes of playing (public server or singleplayer) the game crashes and leaves me with this error: http://www.mediafire.com/?oaka52jd8wx7885

What I expected to happen was...:
The game to run normally

What actually happened was...:
The game crashed randomly

Steps to Reproduce:
1. Start the game
2. Play the game
3. Crash, get error message