Help it breaks after short time

everytime when the server runs a bit it breaks with this error

Unexpected exception
java.lang.NoSuchMethodError: net.minecraft.server.InventoryPlayer.j()Lnet/minecraft/server/ItemStack;
at org.bukkitcontrib.ContribNetServerHandler.a(ContribNetServerHandler.java:178)
at net.minecraft.server.Packet102WindowClick.a(SourceFile:28)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:92)
at net.minecraft.server.NetworkListenThread.a(SourceFile:108)
at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:471)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:374)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)

it runs on a root server

 

If that means what I think it means, you are still running BukkitContrib, which is now Spout for quite a long time. Update your CB and plugins.

 

Glad to see someone is paying attention!