Error with Internal Serer Error

Hello,
if i try to login to my server i get an Internal Server Error.
Here is the log:
2011-09-05 15:10:36 [WARNING] Failed to handle packet: java.lang.NullPointerException java.lang.NullPointerException at net.minecraft.server.ItemStack.d(ItemStack.java:95) at net.minecraft.server.ItemStack.f(ItemStack.java:103) at net.minecraft.server.InventoryPlayer.pickup(InventoryPlayer.java:142) at net.minecraft.server.EntityItem.b(EntityItem.java:144) at net.minecraft.server.EntityHuman.i(EntityHuman.java:219) at net.minecraft.server.EntityHuman.v(EntityHuman.java:211) at net.minecraft.server.EntityPlayer.v(EntityPlayer.java:280) at net.minecraft.server.EntityLiving.m_(EntityLiving.java:218) at net.minecraft.server.EntityHuman.m_(EntityHuman.java:96) at net.minecraft.server.EntityPlayer.a(EntityPlayer.java:192) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:294) at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:592) at net.minecraft.server.Packet10Flying.a(SourceFile:126) at net.minecraft.server.NetworkManager.b(NetworkManager.java:226) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:85) at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:478) at net.minecraft.server.NetworkListenThread.a(SourceFile:105) at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:451) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361) at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)

 

Try updating or removing Spout.