Error when try to host or trying to join (ERROR MESSAGE)

[DoughBoy]

I get this and most people does when people try to host or join aserver with map:

DXMP_[A]NYC_Battle

ERROR MESSAGE:

Connection Failed
Pacakge "DXMP_[A]NYC_Battle" version mismatch/

Any solutions anyone? I tried to redownload it too but most people get that message.

[Dae]

Tell people who you know and who can't get in to download it again. I know whats the error.

[Jeoh]

Yes, you have the newest version, and the others the oldest.