Not in Gzip format

[shade567]

whenever i try to join this server the login screen kicks me off and says not in gzip format, and every time i finally get on it kicks me off every 20 minutes, it doesn't happen with any other server just this one server, I also have login problems on this server, but my friends don't seem to have any trouble, what is the problem?

[Torezu]

It's likely your player.dat file is corrupted - have the server owner delete it.