org.bukkit.event.EventException: This exception has no message.

org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at com.sk89q.worldguard.bukkit.util.Events.fireToCancel(Events.java:74)[worldguard-6.2.jar:?]
	at com.sk89q.worldguard.bukkit.listener.EventAbstractionListener.onInventoryOpen(EventAbstractionListener.java:783)[worldguard-6.2.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[?:1.8.0_111]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_111]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_111]
	at java.lang.reflect.Method.invoke(Unknown Source)[?:1.8.0_111]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callInventoryOpenEvent(CraftEventFactory.java:753)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.EntityPlayer.openContainer(EntityPlayer.java:706)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.BlockShulkerBox.interact(BlockShulkerBox.java:57)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.PlayerInteractManager.a(PlayerInteractManager.java:483)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:904)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:37)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:1)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)[?:1.8.0_111]
	at java.util.concurrent.FutureTask.run(Unknown Source)[?:1.8.0_111]
	at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:739)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:675)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:574)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	at java.lang.Thread.run(Unknown Source)[?:1.8.0_111]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_11_R1.block.CraftShulkerBox cannot be cast to org.bukkit.block.Chest
	at de.epiceric.shopchest.listeners.WorldGuardListener.onUseBlock(WorldGuardListener.java:107)[?:?]
	at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source)[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_111]
	at java.lang.reflect.Method.invoke(Unknown Source)[?:1.8.0_111]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)[spigot.jar:git-Spigot-7d78b81-d5e7885]
	... 29 more