[18:59:46] [Server thread/ERROR]: Could not pass event EnchantItemEvent to EnchantLimit v1.8
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.ContainerEnchantTable.a(ContainerEnchantTable.java:223) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1723) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.PacketPlayInEnchantItem.a(SourceFile:22) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.PacketPlayInEnchantItem.a(SourceFile:8) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_45]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_45]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:714) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [minecraft_server.jar:git-Spigot-d97e08b-880a532]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_45]
	at java.util.HashMap$KeyIterator.next(Unknown Source) ~[?:1.8.0_45]
	at io.github.calemyoung.enchantLimit.ListenerClass.onEnchantmentTableUse(ListenerClass.java:34) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_45]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_45]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_45]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_45]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[minecraft_server.jar:git-Spigot-d97e08b-880a532]
	... 16 more