[21:30:14] [Server thread/INFO]: WinBAT issued server command: /sandbot clear all
[21:30:14] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'sandbot' in plugin SandBot v2.2-SNAPSHOT
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:143) ~[BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:667) ~[BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1178) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:991) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_212]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_212]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:785) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:427) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:724) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:627) [BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.util.ConcurrentModificationException
	at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:719) ~[?:1.8.0_212]
	at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:742) ~[?:1.8.0_212]
	at me.elapsedkid.plugin.sandbot.utils.NPCUtility.removeAllSandBots(NPCUtility.java:117) ~[SandBot-2.2-SNAPSHOT.jar:?]
	at me.elapsedkid.plugin.sandbot.commands.cmds.CmdClear.execute(CmdClear.java:30) ~[SandBot-2.2-SNAPSHOT.jar:?]
	at me.elapsedkid.plugin.sandbot.commands.BaseCommand.onCommand(BaseCommand.java:53) ~[SandBot-2.2-SNAPSHOT.jar:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[BeerSpigot-created-19.04.17:git-TacoSpigot-bf023c7d]
	... 15 more