error: disconnect.overflow

[ageofmyth]

I'm not sure if this is hmod related or client related, but after some unknown event happens on my server, everyone starts to get DC'd and then can't log back in.

This has happened twice to me while using hmod.
1st time, nobody knows how it happened
2nd time, we have a hunch that it had something to do with one of our mods trying to make an ocean using worldedit.
After that point you can never play again until you make a new map.

Server error:
disconnect.overflow

The client error:
java.io.IOException: mark/reset not supported

Anyone know the cause of this problem?