Internal Server Error?

[TheCarterLilleyProject]

We made a mudpack and put it on the Tekkit Platform site for 1.6.4. Me and four friends have tested the client side version and it works fine.

Today, I set up a server for our mudpack. Upon getting on the server, it works for half a second (you see a chat box and the world about to load) and then the server kicks you with 'Internal Server Error.'

this is a log of what it says:

2013-10-12 14:04:44 [iNFO] [sTDOUT] Sending serverside check to: straightdude007

2013-10-12 14:04:46 [sEVERE] [ForgeModLoader] A critical server error occured handling a packet, kicking 1039

net.minecraft.util.ReportedException: Ticking player

at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:374)

at net.minecraft.network.NetServerHandler.func_72498_a(NetServerHandler.java:304)

at net.minecraft.network.packet.Packet10Flying.func_73279_a(SourceFile:136)

at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)

at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)

at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)

at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)

at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)

at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:276)

at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)

at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

Caused by: java.lang.NoSuchMethodError: net.minecraft.entity.player.EntityPlayer.func_71011_bu()Lnet/minecraft/item/ItemStack;

at vazkii.tinkerer.common.enchantment.ModEnchantmentHandler.onEntityUpdate(ModEnchantmentHandler.java:74)

at net.minecraftforge.event.ASMEventHandler_87_ModEnchantmentHandler_onEntityUpdate_LivingUpdateEvent.invoke(.dynamic)

at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)

at net.minecraftforge.event.EventBus.post(EventBus.java:108)

at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:329)

at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1776)

at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:342)

at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:325)

... 11 more

can anyone decipher this? thanks!

[Oli_Dron]

i think that you are useing the client side for the server too or at least in one of the mods