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Attempt made to initialize dimension who isn't registered!
java.lang.RuntimeException: Attempt made to initialize dimension who isn't registered! at net.minecraftforge.common.DimensionManager.lambda$initDimension$2(DimensionManager.java:179)[DimensionManager.class:?] at java.util.Optional.orElseThrow(Optional.java:290)[?:1.8.0_101] at net.minecraftforge.common.DimensionManager.initDimension(DimensionManager.java:179)[DimensionManager.class:?] at net.minecraft.server.MinecraftServer.func_71218_a(MinecraftServer.java:69)[MinecraftServer.class:?] at net.minecraft.server.management.PlayerList.initializeConnectionToPlayer(PlayerList.java:201)[mp.class:?] at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.completeServerSideConnection(NetworkDispatcher.java:260)[NetworkDispatcher.class:?] at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.access$100(NetworkDispatcher.java:73)[NetworkDispatcher.class:?] at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:209)[NetworkDispatcher$1.class:?] at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:287)[eo.class:?] at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180)[md.class:?] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:732)[MinecraftServer.class:?] at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)[ld.class:?] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)[MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)[MinecraftServer.class:?] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_101]