Plutonium

Any suggestions?

Today I tried to see if I could make my own server for WaW zombies in Plutonium, and I managed to get to a point where I could connect to my server using the correct port (server doesnt appear on server list, though) but when I tried to load a custom map, main example: nazi_zombie_hex_tower, I discovered that the server would not start up. However, as soon as I remove the mod I can start up the server again and it works perfectly, but only the original game maps will work, whenever I try to add a modded map into the mix it just does not work, and it gets stuck on ''sending heartbeat...'', but doesnt return 'successful'... Any ideas on why this is happening and how I can fix it so that I can load custom mods / modded maps into my server? Thanks in advance