Calclavia packet failed with CLASS ID: 5 ???

[ded9501]

hi, i have been getting a error spaming in technic console that might causing some lag ofr me on the server m playing on. 

 

[sEVERE] [Calclavia] Calclavia packet failed with CLASS ID: 5
 [iNFO] [sTDERR] java.lang.NullPointerException
 [iNFO] [sTDERR] at java.lang.Class.isAssignableFrom(Native Method)
 [iNFO] [sTDERR] at calclavia.lib.network.PacketAnnotation.receivePacket(PacketAnnotation.java:169)
 [iNFO] [sTDERR] at calclavia.lib.network.PacketHandler.onPacketData(PacketHandler.java:45)
 [iNFO] [sTDERR] at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)
 [iNFO] [sTDERR] at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)
 [iNFO] [sTDERR] at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:85)

[iNFO] [sTDERR] at net.minecraft.client.multiplayer.NetClientHandler.func_72501_a(NetClientHandler.java:1651)
 [iNFO] [sTDERR] at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:61)
 [iNFO] [sTDERR] at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
 [iNFO] [sTDERR] at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
 [iNFO] [sTDERR] at net.minecraft.client.multiplayer.WorldClient.func_72835_b(WorldClient.java:99)
 [iNFO] [sTDERR] at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1930)
 [iNFO] [sTDERR] at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
 [iNFO] [sTDERR] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
 [iNFO] [sTDERR] at net.minecraft.client.main.Main.main(SourceFile:101)
 [iNFO] [sTDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [iNFO] [sTDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 [iNFO] [sTDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 [iNFO] [sTDERR] at java.lang.reflect.Method.invoke(Unknown Source)
 [iNFO] [sTDERR] at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
 [iNFO] [sTDERR] at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

 

checked whit singel player and others servers but no problem there, anyone whit any knolage can help soulve this problem plz