BO3 Server browser

Hello!

I've recently bought BO3 for zombies, as I heard that the modding community is great. I know that one way to access the servers with mods is through the server browser but for some reason this is not working for me. I get the msgs ''Mod subscribed'' '' Mod installation'' etc I get into the lobby where I can see the names of other people and then instead of having the map/match loaded I get kicked with the message ''Game session is no longer available''. This happens with every server that I try to join and I don't know what could be the reason.