Files different from server

Ok here is the problem, I tested a texture hack and it didn't worked. The only thing that is now happening is everytime a map finish to load ( same if there is no texture hack ) its kicking me out and telling me :

Files different from server.

u can try reinstall the game!

Just try clicking RM button @ steam on teh MW2 MP, choosing Properties -> Local Files -> Verify Integrity of game cache