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java.lang.UnsupportedOperationException at java.util.Collections$UnmodifiableList.remove(Collections.java:1317) at com.abecderic.labyrinth.worldgen.room.RoomGenerator.getBlockState(RoomGenerator.java:142) at com.abecderic.labyrinth.worldgen.room.RoomGenerator.getBlockState(RoomGenerator.java:170) at com.abecderic.labyrinth.worldgen.room.RoomGenerator.applyReplacement(RoomGenerator.java:108) at com.abecderic.labyrinth.worldgen.room.RoomGenerator.generateRoomAt(RoomGenerator.java:91) at com.abecderic.labyrinth.worldgen.LabyrinthChunkGenerator.func_185931_b(LabyrinthChunkGenerator.java:124) at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1000) at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:974) at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:154) 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)