Crash log

java.lang.IllegalArgumentException: Could not get provider type for dimension 16, does not exist
	at net.minecraftforge.common.DimensionManager.getProviderType(DimensionManager.java:148)
	at net.minecraftforge.common.DimensionManager.createProviderFor(DimensionManager.java:302)
	at net.minecraft.world.WorldProvider.func_76570_a(WorldProvider.java:160)
	at net.minecraft.client.multiplayer.WorldClient.<init>(WorldClient.java:54)
	at net.minecraft.client.network.NetHandlerPlayClient.func_147282_a(NetHandlerPlayClient.java:237)
	at net.minecraft.network.play.server.S01PacketJoinGame.func_148833_a(SourceFile:70)
	at net.minecraft.network.play.server.S01PacketJoinGame.func_148833_a(SourceFile:13)
	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
	at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(SourceFile:78)
	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1649)
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
	at net.minecraft.client.main.Main.main(SourceFile:148)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)