when i try to connect to any server it says invalid game file!
I have tried both repairing and reinstalling, but it wont work! What should i do?

Same thing is happening to me...I wonder why?

Remove any mods - one of them is either corrupt or is too big. Uninstall and delete the Ace of Spades directory if you're unsure - then reinstall.

Yea this worked for me. I made a mod pack but it was too big so it didnt work. So i uninstalled it -AoS- and it works fine.

@twosai:
I have had that error when trying to add something to the playerhead..
I think bcool has implemeted checking features to make sure the shape is not majorly altered, because it would be pretty unfair if someone could.