---- Minecraft Crash Report ----

WARNING: coremods are present:
  SpongeCoremod (spongeforge-1.8.9-1763-4.1.0-BETA-1207.jar)
  Java8CheckerCoremod (Pixelmon-1.8.9-4.2.3-universal.jar)
Contact their authors BEFORE contacting forge

// I'm sorry, Dave.

Time: 3/20/16 5:34 AM
Description: Exception ticking world

java.lang.NullPointerException: Exception ticking world
	at net.minecraft.world.gen.structure.MapGenStructure.func_143027_a(MapGenStructure.java:220)
	at net.minecraft.world.gen.structure.MapGenStructure.func_175795_b(MapGenStructure.java:98)
	at net.minecraft.world.gen.ChunkProviderHell.func_177458_a(ChunkProviderHell.java:470)
	at org.spongepowered.common.world.gen.SpongeChunkProvider.func_177458_a(SpongeChunkProvider.java:328)
	at net.minecraft.world.gen.ChunkProviderServer.func_177458_a(ChunkProviderServer.java:376)
	at net.minecraft.world.WorldServer.func_175734_a(WorldServer.java:239)
	at net.minecraft.world.SpawnerAnimals.func_77192_a(SpawnerAnimals.java:114)
	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:199)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:690)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:344)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:605)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481)
	at java.lang.Thread.run(Thread.java:745)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at net.minecraft.world.gen.structure.MapGenStructure.func_143027_a(MapGenStructure.java:220)
	at net.minecraft.world.gen.structure.MapGenStructure.func_175795_b(MapGenStructure.java:98)
	at net.minecraft.world.gen.ChunkProviderHell.func_177458_a(ChunkProviderHell.java:470)
	at org.spongepowered.common.world.gen.SpongeChunkProvider.func_177458_a(SpongeChunkProvider.java:328)
	at net.minecraft.world.gen.ChunkProviderServer.func_177458_a(ChunkProviderServer.java:376)
	at net.minecraft.world.WorldServer.func_175734_a(WorldServer.java:239)
	at net.minecraft.world.SpawnerAnimals.func_77192_a(SpawnerAnimals.java:114)
	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:199)