[1.11][SMP]NoSuchFieldException: activ

java.io.IOException: Bad packet id 108
        at vl.a(SourceFile:139)
        at iq.e(SourceFile:190)
        at iq.c(SourceFile:10)
        at no.run(SourceFile:77)
java.lang.RuntimeException: java.lang.NoSuchFieldException: activ
        at ic2.platform.NetworkManager.handlePacket(NetworkManager.java:151)
        at ic2.platform.Ic2.HandlePacket(Ic2.java:262)
        at ModLoaderMp.HandleAllPackets(ModLoaderMp.java:83)
        at Packet230ModLoader.a(Packet230ModLoader.java:147)
        at iq.b(SourceFile:272)
        at wt.b(NetClientHandler.java:64)
        at gx.c(SourceFile:57)
        at net.minecraft.client.Minecraft.k(SourceFile:1388)
        at net.minecraft.client.Minecraft.run(SourceFile:666)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoSuchFieldException: activ
        at ic2.platform.NetworkManager.handlePacket(NetworkManager.java:111)
        ... 9 more