1.) Either you're not running the latest version or you have internet problems (Restart the game a few times)
2.) If it keeps happening, then you're HWID banned and will not be able to play IW4M/IW5M anymore.
Since there are no current bypasses for this ban and since asking/begging for hacks is not allowed (Because we all know that's your next question, "Make me a ban bypasser?" etc.) AND since there's no other solution for this as we're not 4D1:
//Closed (That was alot to type )
The Following User Says Thank You to Kenshin13 For This Useful Post: