Code

[00:23:48] [Server thread/ERROR] [FML]: Index: 1 Listeners:
[00:23:48] [Server thread/ERROR] [FML]: 0: NORMAL
[00:23:48] [Server thread/ERROR] [FML]: 1: ASM: com.steelfeathers.talesofskyrim.events.TalesOfSkyrimEvents@234cfd94 onEvent(Lnet/minecraftforge/event/terraingen/PopulateChunkEvent$Post;)V
[00:23:48] [Server thread/ERROR]: Encountered an unexpected exception
java.util.ConcurrentModificationException
	at java.util.LinkedList$ListItr.checkForComodification(Unknown Source) ~[?:1.8.0_121]
	at java.util.LinkedList$ListItr.remove(Unknown Source) ~[?:1.8.0_121]
	at net.minecraft.world.gen.structure.StructureStart.generateStructure(StructureStart.java:52) ~[StructureStart.class:?]
	at net.minecraft.world.gen.structure.MapGenStructure.generateStructure(MapGenStructure.java:97) ~[MapGenStructure.class:?]
	at com.steelfeathers.talesofskyrim.events.TalesOfSkyrimEvents.onEvent(TalesOfSkyrimEvents.java:69) ~[TalesOfSkyrimEvents.class:?]
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_10_TalesOfSkyrimEvents_onEvent_Post.invoke(.dynamic) ~[?:?]
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:185) ~[EventBus.class:?]
	at net.minecraftforge.event.ForgeEventFactory.onChunkPopulate(ForgeEventFactory.java:636) ~[ForgeEventFactory.class:?]
	at net.minecraft.world.gen.ChunkProviderFlat.populate(ChunkProviderFlat.java:218) ~[ChunkProviderFlat.class:?]
	at net.minecraft.world.chunk.Chunk.populateChunk(Chunk.java:1071) ~[Chunk.class:?]
	at net.minecraft.world.chunk.Chunk.populateChunk(Chunk.java:1052) ~[Chunk.class:?]
	at net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:164) ~[ChunkProviderServer.class:?]
	at net.minecraft.server.MinecraftServer.initialWorldChunkLoad(MinecraftServer.java:340) ~[MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:107) ~[IntegratedServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.init(IntegratedServer.java:124) ~[IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:507) [MinecraftServer.class:?]