Server Error

[00:39:11] [Server thread/INFO] [io.github.hsyyid.essentialcmds]: [Rasgnarok] executed command tpworld DIM-1[m> [00:39:11] [Server thread/ERROR]: Encountered an unexpected exceptionnet.minecraft.util.ReportedException: Exception ticking world at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:696) ~[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(Thread.java:745) [?:1.8.0_72]Caused by: java.lang.NullPointerException at net.minecraft.world.gen.structure.MapGenStructure.func_143027_a(MapGenStructure.java:220) ~[aqq.class:?] at net.minecraft.world.gen.structure.MapGenStructure.func_175795_b(MapGenStructure.java:98) ~[aqq.class:?] at net.minecraft.world.gen.ChunkProviderHell.func_177458_a(ChunkProviderHell.java:470) ~[anw.class:?] at org.spongepowered.common.world.gen.SpongeChunkProvider.func_177458_a(SpongeChunkProvider.java:328) ~[SpongeChunkProvider.class:1.8.9-1763-4.1.0-BETA-1209] at net.minecraft.world.gen.ChunkProviderServer.func_177458_a(ChunkProviderServer.java:376) ~[ld.class:?] at net.minecraft.world.WorldServer.func_175734_a(WorldServer.java:239) ~[le.class:?] at net.minecraft.world.SpawnerAnimals.func_77192_a(SpawnerAnimals.java:114) ~[adt.class:?] at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:199) ~[le.class:?] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:690) ~[MinecraftServer.class:?] ... 4 more[m> [00:39:11] [Server thread/ERROR]: This crash report has been saved to: /home/minecraft/mc-instances/mc-56e9bcfd1402d/./crash-reports/crash-2016-03-20_00.39.11-server.txt[m> [00:39:11] [Server thread/INFO]: Stopping server[m> [00:39:11] [Server thread/INFO]: Saving players[m> [00:39:11] [Server thread/INFO]: Saving worlds[m> [00:39:11] [Server thread/INFO]: Saving chunks for level 'ObliqueMain'/Overworld[m> [00:39:11] [Server thread/INFO]: Saving chunks for level 'DIM-1'/Nether[m> [00:39:11] [Server thread/INFO]: Saving chunks for level 'DIM1'/The End[m> [00:39:11] [Server thread/INFO]: Saving chunks for level 'world'/Overworld[m> [00:39:12] [Server thread/INFO] [FML]: Unloading dimension 0 (ObliqueMain)[m> [00:39:12] [Server thread/INFO] [FML]: Unloading dimension -1 (DIM-1)[m> [00:39:12] [Server thread/INFO] [FML]: Unloading dimension 1 (DIM1)[m> [00:39:12] [Server thread/INFO] [FML]: Unloading dimension 2 (world)[m> [00:39:12] [Server thread/INFO] [FML]: Applying holder lookups[m> [00:39:12] [Server thread/INFO] [FML]: Holder lookups applied[m> [00:39:12] [Server thread/INFO] [FML]: The state engine was in incorrect state SERVER_STOPPING and forced into state SERVER_STOPPED. Errors may have been discarded.