[1.12]How to make new dimensions?

I am trying to make a new dimension but when I try to go there I get the error below.

this is how i register the dimension

here

DimensionRegister.mainRegistry() gets called here

this is where the Player.changeDimension() gets called .This works some times but only if the DimensionType that I pass  into DimensionManager.registerDimension() is one of the existing enum. if i use DimensionType.register() it never works and gives me the error below

https://github.com/JavaMan7/Subterranean-Creatures-Mod/blob/fc629349dcf701fcd7cf8265fea2560e4572f794/src/main/java/com/javaman/subteranean/items/TransDimensionalOrb.java

could some one tell me what im doing wrong and how to do it the right way with an example. 

java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_144]
    at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_144]
    at net.minecraft.util.Util.runTask(Util.java:54) [Util.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:795) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:740) [MinecraftServer.class:?]
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:589) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.NullPointerException
    at net.minecraft.world.Teleporter.placeInExistingPortal(Teleporter.java:136) ~[Teleporter.class:?]
    at net.minecraft.world.Teleporter.placeInPortal(Teleporter.java:39) ~[Teleporter.class:?]
    at net.minecraft.server.management.PlayerList.transferEntityToWorld(PlayerList.java:748) ~[PlayerList.class:?]
    at net.minecraft.server.management.PlayerList.transferEntityToWorld(PlayerList.java:675) ~[PlayerList.class:?]
    at com.javaman.subteranean.items.TransDimensionalOrb.onItemRightClick(TransDimensionalOrb.java:84) ~[TransDimensionalOrb.class:?]
    at net.minecraft.item.ItemStack.useItemRightClick(ItemStack.java:234) ~[ItemStack.class:?]
    at net.minecraft.server.management.PlayerInteractionManager.processRightClick(PlayerInteractionManager.java:385) ~[PlayerInteractionManager.class:?]
    at net.minecraft.network.NetHandlerPlayServer.processTryUseItem(NetHandlerPlayServer.java:784) ~[NetHandlerPlayServer.class:?]
    at net.minecraft.network.play.client.CPacketPlayerTryUseItem.processPacket(CPacketPlayerTryUseItem.java:43) ~[CPacketPlayerTryUseItem.class:?]
    at net.minecraft.network.play.client.CPacketPlayerTryUseItem.processPacket(CPacketPlayerTryUseItem.java:9) ~[CPacketPlayerTryUseItem.class:?]
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) ~[PacketThreadUtil$1.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_144]
    at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_144]
    at net.minecraft.util.Util.runTask(Util.java:53) ~[Util.class:?]
    ... 5 more
[12:42:41] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_144]
    at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_144]
    at net.minecraft.util.Util.runTask(Util.java:54) [Util.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:795) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:740) [MinecraftServer.class:?]
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:589) [MinecraftServer.class:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.NullPointerException
    at net.minecraft.world.Teleporter.placeInExistingPortal(Teleporter.java:136) ~[Teleporter.class:?]
    at net.minecraft.world.Teleporter.placeInPortal(Teleporter.java:36) ~[Teleporter.class:?]
    at net.minecraft.server.management.PlayerList.transferEntityToWorld(PlayerList.java:748) ~[PlayerList.class:?]
    at net.minecraft.server.management.PlayerList.transferEntityToWorld(PlayerList.java:675) ~[PlayerList.class:?]
    at com.javaman.subteranean.items.TransDimensionalOrb.onItemRightClick(TransDimensionalOrb.java:84) ~[TransDimensionalOrb.class:?]
    at net.minecraft.item.ItemStack.useItemRightClick(ItemStack.java:234) ~[ItemStack.class:?]
    at net.minecraft.server.management.PlayerInteractionManager.processRightClick(PlayerInteractionManager.java:385) ~[PlayerInteractionManager.class:?]
    at net.minecraft.network.NetHandlerPlayServer.processTryUseItem(NetHandlerPlayServer.java:784) ~[NetHandlerPlayServer.class:?]
    at net.minecraft.network.play.client.CPacketPlayerTryUseItem.processPacket(CPacketPlayerTryUseItem.java:43) ~[CPacketPlayerTryUseItem.class:?]
    at net.minecraft.network.play.client.CPacketPlayerTryUseItem.processPacket(CPacketPlayerTryUseItem.java:9) ~[CPacketPlayerTryUseItem.class:?]
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) ~[PacketThreadUtil$1.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_144]
    at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_144]
    at net.minecraft.util.Util.runTask(Util.java:53) ~[Util.class:?]
    ... 5 more