[18:33:18] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Attempted to remove a multipart at an illegal position!
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_91]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_91]
	at net.minecraft.util.Util.runTask(Util.java:26) [Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:742) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:687) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:156) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:536) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: java.lang.IllegalStateException: Attempted to remove a multipart at an illegal position!
	at mcmultipart.network.MessageMultipartChange.newPacket(MessageMultipartChange.java:149) ~[MessageMultipartChange.class:?]
	at mcmultipart.multipart.MultipartContainer.removePart(MultipartContainer.java:236) ~[MultipartContainer.class:?]
	at mcmultipart.multipart.MultipartContainer.removePart(MultipartContainer.java:205) ~[MultipartContainer.class:?]
	at mcmultipart.multipart.Multipart.harvest(Multipart.java:164) ~[Multipart.class:?]
	at mcmultipart.multipart.MultipartContainer.harvest(MultipartContainer.java:343) ~[MultipartContainer.class:?]
	at mcmultipart.block.BlockMultipartContainer.removedByPlayer(BlockMultipartContainer.java:165) ~[BlockMultipartContainer.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.removeBlock(PlayerInteractionManager.java:298) ~[PlayerInteractionManager.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.removeBlock(PlayerInteractionManager.java:292) ~[PlayerInteractionManager.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.tryHarvestBlock(PlayerInteractionManager.java:339) ~[PlayerInteractionManager.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.onBlockClicked(PlayerInteractionManager.java:175) ~[PlayerInteractionManager.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processPlayerDigging(NetHandlerPlayServer.java:658) ~[NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.CPacketPlayerDigging.processPacket(CPacketPlayerDigging.java:56) ~[CPacketPlayerDigging.class:?]
	at net.minecraft.network.play.client.CPacketPlayerDigging.processPacket(CPacketPlayerDigging.java:12) ~[CPacketPlayerDigging.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:15) ~[PacketThreadUtil$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_91]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_91]
	at net.minecraft.util.Util.runTask(Util.java:25) ~[Util.class:?]
	... 5 more