We've noticed that... Well, pretty much all of you have gone and updated your clients. As a result of this, you're unable to connect to the server, which is still running 1.8.1.
If you'd like to downgrade your client to be able to play on the server again then please download this tool from minecraftforums.
It'll allow you to select any version of MC to downgrade/upgrade your client to. Select 1.8.1 if you wish to play on Pawncraft.
Pawncraft is nearly ready to move to 1.0.0, but is still waiting for a few plugins to update (and for Bukkit to release a recommended build) so until then you'll need to play on 1.8.1.
We hope this post was helpful and you'll continue to enjoy the server.
- Pawncraft Team