Server problem, bad packet id 254

This message pops up on the console about every 5-10 seconds, i dont know what it is or what is wrong. can someone please tell me what this means



Here is a piece of the log:

2011-09-17 12:07:26 [SEVERE] java.io.IOException: Bad packet id 254
2011-09-17 12:07:26 [SEVERE] at net.minecraft.server.Packet.a(Packet.java:73)
2011-09-17 12:07:26 [SEVERE] at net.minecraft.server.NetworkManager.g(NetworkManager.java:149)
2011-09-17 12:07:26 [SEVERE] at net.minecraft.server.NetworkManager.c(NetworkManager.java:259)
2011-09-17 12:07:26 [SEVERE] at net.minecraft.server.NetworkReaderThread.run(SourceFile:84)
2011-09-17 12:07:26 [INFO] /24.101.171.65:59952 lost connection
2011-09-17 12:07:29 [SEVERE] java.io.IOException: Bad packet id 254
2011-09-17 12:07:29 [SEVERE] at net.minecraft.server.Packet.a(Packet.java:73)
2011-09-17 12:07:29 [SEVERE] at net.minecraft.server.NetworkManager.g(NetworkManager.java:149)
2011-09-17 12:07:29 [SEVERE] at net.minecraft.server.NetworkManager.c(NetworkManager.java:259)
2011-09-17 12:07:29 [SEVERE] at net.minecraft.server.NetworkReaderThread.run(SourceFile:84)
2011-09-17 12:07:29 [INFO] /121.215.14.31:54012 lost connection
2011-09-17 12:07:44 [SEVERE] java.io.IOException: Bad packet id 254
2011-09-17 12:07:44 [SEVERE] at net.minecraft.server.Packet.a(Packet.java:73)
2011-09-17 12:07:44 [SEVERE] at net.minecraft.server.NetworkManager.g(NetworkManager.java:149)
2011-09-17 12:07:44 [SEVERE] at net.minecraft.server.NetworkManager.c(NetworkManager.java:259)
2011-09-17 12:07:44 [SEVERE] at net.minecraft.server.NetworkReaderThread.run(SourceFile:84)
2011-09-17 12:07:44 [INFO] /2.216.26.221:53873 lost connection

 

There is explanation: http://forums.bukkit.org/threads/bad-packet-id-254.36549/#post-673189

 

Ok ty