---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 6/22/13 1:20 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/texture/IconRegister
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2451)
        at java.lang.Class.getMethod0(Class.java:2694)
        at java.lang.Class.getMethod(Class.java:1622)
        at mods.immibis.microblocks.coremod.MicroblockSupporterTransformer$Util.collisionRayTrace(MicroblockSupporterTransformer.java:1025)
        at dan200.computer.shared.BlockCable.func_71878_a(BlockCable.java)
        at net.minecraft.world.World.func_72831_a(World.java:1597)
        at net.minecraft.world.World.func_72901_a(World.java:1406)
        at net.minecraft.network.NetServerHandler.func_72524_a(NetServerHandler.java:1439)
        at net.minecraft.network.packet.Packet18Animation.func_73279_a(SourceFile:41)
        at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:442)
        at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:222)
        at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)
        at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:852)
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:320)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:721)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:605)
        at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.renderer.texture.IconRegister
        at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:273)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
        ... 19 more
Caused by: java.lang.NullPointerException