(ERROR) Do not know why this error is happening!

I have a problem on my server.
I need help, searched the forum a bit and not found the answer!
help me with this error


13:02:03 [WARNING] Failed to handle packet: java.lang.NullPointerException
java.lang.NullPointerException
at net.minecraft.server.ServerConfigurationManager.attemptLogin(ServerConfigurationManager.java:207)
at net.minecraft.server.NetLoginHandler.b(NetLoginHandler.java:102)
at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:94)
at net.minecraft.server.Packet1Login.handle(SourceFile:68)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:48)
at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:61)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Soon after this error happens the server shuts down

@OFF
http://knightsofminecraft.blogspot.com.br/
http://www.knightsofminecraft.com.br/Forum/

 

1. "(ERROR)" is not a helpful thread title. A helpful thread title is something like "Server crashing after NPE"
2. You provided us with no information on your server such as plugins, CB version, etc.
3. Please refer to this to allow us to be more helpful

EDIT: this is the first thing that comes up when I google "bukkit Failed to handle packet".
So you really did not search at all.

 

could you advise me?