Are you trying to use the trainer in multiplayer mode? Most trainers are made to work with SINGLE PLAYER MODE only. Here at Cheat Happens, we never intentionally create or post cheats that work in a multiplayer environment. Cheats (in our opinion) should only be used for single player modes and trying to use them in multiplayer will cause the cheats not to work and may possibly get you banned from that game's multiplayer servers.
So the Trainer will NOT let you to enter.