faweerror

[14:13:28] [Server thread/INFO]: iTzAndy_ issued server command: //naturalize
[14:13:29] [Craft Scheduler Thread - 10/ERROR]: An unexpected error while handling a WorldEdit command
java.lang.ArrayIndexOutOfBoundsException: 16
        at com.boydti.fawe.beta.implementation.blocks.CharBlocks.get(CharBlocks.java:114) ~[?:?]
        at com.boydti.fawe.beta.implementation.blocks.CharBlocks.getBlock(CharBlocks.java:108) ~[?:?]
        at com.boydti.fawe.beta.implementation.chunk.ChunkHolder$2.getBlock(ChunkHolder.java:328) ~[?:?]
        at com.boydti.fawe.beta.implementation.chunk.ChunkHolder.getBlock(ChunkHolder.java:781) ~[?:?]
        at com.boydti.fawe.beta.implementation.chunk.ChunkHolder$4.getBlock(ChunkHolder.java:524) ~[?:?]
        at com.boydti.fawe.beta.implementation.chunk.ChunkHolder.getBlock(ChunkHolder.java:781) ~[?:?]
        at com.boydti.fawe.beta.implementation.IChunkExtent.getBlock(IChunkExtent.java:58) ~[?:?]
        at com.sk89q.worldedit.extent.InputExtent.getBlock(InputExtent.java:52) ~[?:?]
        at com.sk89q.worldedit.extent.PassthroughExtent.getBlock(PassthroughExtent.java:182) ~[?:?]
        at com.sk89q.worldedit.extent.PassthroughExtent.getBlock(PassthroughExtent.java:182) ~[?:?]
        at com.sk89q.worldedit.math.BlockVector3.getBlock(BlockVector3.java:731) ~[?:?]
        at com.sk89q.worldedit.function.mask.BlockTypeMask.test(BlockTypeMask.java:114) ~[?:?]
        at com.sk89q.worldedit.function.block.Naturalizer.isGround(Naturalizer.java:66) ~[?:?]
        at com.sk89q.worldedit.function.visitor.LayerVisitor.resume(LayerVisitor.java:99) ~[?:?]
        at com.sk89q.worldedit.function.operation.Operations.completeBlindly(Operations.java:76) ~[?:?]
        at com.sk89q.worldedit.EditSession.naturalizeCuboidBlocks(EditSession.java:1465) ~[?:?]
        at com.sk89q.worldedit.command.RegionCommands.naturalize(RegionCommands.java:366) ~[?:?]
        at com.sk89q.worldedit.command.RegionCommandsRegistration.cmd$_naturalize(RegionCommandsRegistration.java:762) ~[?:?]
        at org.enginehub.piston.CommandManager.execute(CommandManager.java:157) ~[?:?]
        at com.sk89q.worldedit.extension.platform.PlatformCommandManager.lambda$handleCommandOnCurrentThread$15(PlatformCommandManager.java:682) ~[?:?]
        at com.sk89q.worldedit.extension.platform.PlatformCommandManager.handleCommandTask(PlatformCommandManager.java:698) ~[?:?]
        at com.sk89q.worldedit.extension.platform.PlatformCommandManager.handleCommandOnCurrentThread(PlatformCommandManager.java:684) ~[?:?]
        at com.sk89q.worldedit.extension.platform.PlatformCommandManager.lambda$handleCommand$13(PlatformCommandManager.java:654) ~[?:?]
        at org.bukkit.craftbukkit.v1_16_R1.scheduler.CraftTask.run(CraftTask.java:81) [spigot-1.16.1.jar:git-Spigot-0287a20-7560f5f]
        at org.bukkit.craftbukkit.v1_16_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:54) [spigot-1.16.1.jar:git-Spigot-0287a20-7560f5f]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_251]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_251]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]