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java.lang.AssertionError at io.netty.channel.embedded.EmbeddedChannel.writeOutbound(EmbeddedChannel.java:203)[EmbeddedChannel.class:?] at org.spongepowered.common.world.DimensionManager.sendDimensionRegistration(DimensionManager.java:159)[DimensionManager.class:1.8.9-1890-4.2.0-BETA-1511] at net.minecraft.server.management.ServerConfigurationManager.initializeConnectionToPlayer(ServerConfigurationManager.java:276)[lx.class:?] at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.completeServerSideConnection(NetworkDispatcher.java:239)[NetworkDispatcher.class:?] at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.access$100(NetworkDispatcher.java:54)[NetworkDispatcher.class:?] at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:190)[NetworkDispatcher$1.class:?] at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:289)[ek.class:?] at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:189)[ll.class:?] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:724)[MinecraftServer.class:?] at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:344)[ko.class:?] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:605)[MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481)[MinecraftServer.class:?] at java.lang.Thread.run(Unknown Source)[?:1.8.0_92]