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

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.
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.