Bukkit

 I get this error when I try to use the command /shot config reload

this started happening after I upgraded to spigot 1.12, I hope bugs like this dont spell the end for this plugin

[23:43:12] [Server thread/INFO]: RobotnikMan issued server command: /shot config reload
[23:43:12] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'shot' in plugin CrackShot v0.98.4
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[minecraft_server.jar:git-Spigot-7228328-d603539]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[minecraft_server.jar:git-Spigot-7228328-d603539]
    at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:644) ~[minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1385) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1220) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_121]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_121]
    at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:747) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [minecraft_server.jar:git-Spigot-7228328-d603539]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.lang.UnsupportedOperationException
    at com.google.common.collect.UnmodifiableIterator.remove(UnmodifiableIterator.java:46) ~[minecraft_server.jar:git-Spigot-7228328-d603539]
    at org.bukkit.craftbukkit.v1_12_R1.inventory.RecipeIterator.remove(RecipeIterator.java:51) ~[minecraft_server.jar:git-Spigot-7228328-d603539]
    at com.shampaggon.crackshot.CSMinion.clearRecipes(CSMinion.java:75) ~[?:?]
    at com.shampaggon.crackshot.CSDirector.onCommand(CSDirector.java:449) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[minecraft_server.jar:git-Spigot-7228328-d603539]
    ... 15 more

I had the same problem but when I disabled all sneak in the config the error stops try that and see if it stops or carries on?