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java.lang.IllegalArgumentException: Failed to register dimension for id 666, One is already registered at net.minecraftforge.common.DimensionManager.registerDimension(DimensionManager.java:118)[DimensionManager.class:?] at org.dave.CompactMachines.network.MessageConfiguration.onMessage(MessageConfiguration.java:46)[MessageConfiguration.class:?] at org.dave.CompactMachines.network.MessageConfiguration.onMessage(MessageConfiguration.java:14)[MessageConfiguration.class:?] at cpw.mods.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:37)[SimpleChannelHandlerWrapper.class:?] at cpw.mods.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper.channelRead0(SimpleChannelHandlerWrapper.java:17)[SimpleChannelHandlerWrapper.class:?] at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98)[SimpleChannelInboundHandler.class:?] at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)[DefaultChannelHandlerContext.class:?] at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)[DefaultChannelHandlerContext.class:?] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)[MessageToMessageDecoder.class:?] at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111)[MessageToMessageCodec.class:?] at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337)[DefaultChannelHandlerContext.class:?] at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323)[DefaultChannelHandlerContext.class:?] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785)[DefaultChannelPipeline.class:?] at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169)[EmbeddedChannel.class:?] at cpw.mods.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:77)[FMLProxyPacket.class:?] at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)[ej.class:?] at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(SourceFile:78)[bcx.class:?] at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1661)[bao.class:?] at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)[bao.class:?] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)[bao.class:?] at net.minecraft.client.main.Main.main(SourceFile:148)[Main.class:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[?:1.8.0_77] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_77] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_77] at java.lang.reflect.Method.invoke(Unknown Source)[?:1.8.0_77] at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)[launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28)[launchwrapper-1.12.jar:?]