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java.util.ConcurrentModificationException: 	at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)	at java.util.LinkedList$ListItr.next(LinkedList.java:888)	at net.minecraft.world.gen.structure.StructureStart.func_75068_a(StructureStart.java:45)	at net.minecraft.world.gen.structure.MapGenStructure.func_175794_a(MapGenStructure.java:90)	at net.minecraft.world.gen.structure.MapGenStructure.populate(MapGenStructure.java:64)	at org.spongepowered.api.world.gen.Populator.populate(Populator.java:101)	at org.spongepowered.mod.world.gen.SpongeChunkGeneratorForge.func_185931_b(SpongeChunkGeneratorForge.java:224)	at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1000)	at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:964)	at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:154)	at net.minecraft.server.management.PlayerChunkMapEntry.redirect$onProvidePlayerChunk$0(PlayerChunkMapEntry.java:79)	at net.minecraft.server.management.PlayerChunkMapEntry.func_187268_a(PlayerChunkMapEntry.java:126)	at net.minecraft.server.management.PlayerChunkMap.func_72693_b(SourceFile:147)	at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:222)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:698)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)	at java.lang.Thread.run(Thread.java:745)