Games : My pokemon in my pixelmon server, don't appear when i send them out

I have a pixelmon server for me and my friend to play on. Its been working fine for the last week, but when i came on it today, and I threw out my pokemon it wouldn't show up. It would say, sent out Charizard, even though nothing happened. How do I make my pokemon appear? Any help would be appreciated.

Extra info: I play on mac, and i run the server. Server has 3gb of ram.