[Server thread/ERROR]: Could not pass event InventoryMoveItemEvent to ChestShop v3.8.1
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.TileEntityHopper.tryTakeInItemFromSlot(TileEntityHopper.java:463) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.TileEntityHopper.suckInItems(TileEntityHopper.java:429) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.TileEntityHopper.i(TileEntityHopper.java:251) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.TileEntityHopper.h(TileEntityHopper.java:228) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.World.tickEntities(World.java:1516) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.WorldServer.tickEntities(WorldServer.java:516) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:706) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
Caused by: java.lang.ClassCastException: org.bukkit.block.DoubleChest cannot be cast to org.bukkit.block.Chest
	at org.bukkit.block.DoubleChest.getWorld(DoubleChest.java:36) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at org.bukkit.block.DoubleChest.getLocation(DoubleChest.java:32) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	at com.Acrobot.ChestShop.Signs.ChestShopSign.isShopChest(ChestShopSign.java:72) ~[?:?]
	at com.Acrobot.ChestShop.Listeners.Item.ItemMoveListener.onItemMove(ItemMoveListener.java:21) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[craftbukkit.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
	... 14 more