java.lang.IllegalArgumentException: Cube at 12 already exists!
    at cubicchunks.world.column.CubeMap.put(CubeMap.java:72)
    at net.minecraft.world.chunk.Chunk.addCube(Chunk.java:2782)
    at cubicchunks.server.CubeProviderServer.onCubeLoaded(CubeProviderServer.java:309)
    at cubicchunks.server.CubeProviderServer.getCube(CubeProviderServer.java:289)
    at cubicchunks.server.CubeProviderServer.getCube(CubeProviderServer.java:220)
    at net.minecraft.world.chunk.Chunk.getEBS_CubicChunks(Chunk.java:1809)
    at net.minecraft.world.chunk.Chunk.redirect$getLightSubtracted_CubicChunks_EBSGetRedirect$zzk000(Chunk.java:2140)
    at net.minecraft.world.chunk.Chunk.getLightSubtracted(Chunk.java:728)
    at net.minecraft.world.World.getLight(World.java:788)
    at net.minecraft.world.World.getLight(World.java:749)
    at net.minecraft.world.World.getLightFromNeighbors(World.java:739)
    at net.minecraft.block.BlockGrass.updateTick(BlockGrass.java:45)
    at net.minecraft.block.Block.randomTick(Block.java:605)
    at net.minecraft.world.WorldServer.updateBlocks(WorldServer.java:493)
    at net.minecraft.world.WorldServer.tick(WorldServer.java:228)
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:784)
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:699)
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:548)
    at java.lang.Thread.run(Thread.java:748)