Error when playing the SP missions in MP/anyone want to play
 

I started a regular dm game (alone) and changed to mission 1 | 3 c. It worked. Whenever I try to join a server, as soon as the host changes to the map I get an error. I see the SP map for about a second.

Anyone who has done this before: how can you get rid of the error?

I've not been able to do this right for the past 2 hours. If anyone want to play some Coop, please write here.

I really (really) want to try this.

I really dont know how this works so i cant help you! But i sure would love to try that sniper village single mission in multiplayer..lol