Minecraft server na linuxex

2012-05-21 20:22:34 [INFO] Starting minecraft server version 1.2.5
2012-05-21 20:22:34 [INFO] Loading properties
2012-05-21 20:22:34 [INFO] Starting Minecraft server on *:25565
2012-05-21 20:22:39 [WARNING] **** FAILED TO BIND TO PORT!
2012-05-21 20:22:39 [WARNING] The exception was: java.lang.NoSuchMethodError: method java.net.ServerSocket.setPerformancePreferenc$
2012-05-21 20:22:39 [WARNING] Perhaps a server is already running on that port?
2012-05-21 20:23:20 [INFO] Stopping server

všetky porty sú odblokované a skúšal som aj iné...