CreeperHeal Error

08:46 PM [SEVERE] Could not pass event BlockPhysicsEvent to CreeperHeal v6.7.2
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R4.inventory.CraftInventory cannot be cast to org.bukkit.inventory.DoubleChestInventory
	at com.nitnelave.CreeperHeal.block.CreeperChest.<init>(CreeperChest.java:48)
	at com.nitnelave.CreeperHeal.block.CreeperBlock.newBlock(CreeperBlock.java:69)
	at com.nitnelave.CreeperHeal.listeners.RailsUpdateListener.onBlockPhysics(RailsUpdateListener.java:30)
	at sun.reflect.GeneratedMethodAccessor279.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:334)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:507)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:492)
	at net.minecraft.world.World.func_147460_e(World.java:1064)
	at net.minecraft.world.World.func_147441_b(World.java:1026)
	at dan200.computercraft.shared.util.RedstoneUtil.propogateRedstoneOutput(RedstoneUtil.java:88)
	at dan200.computercraft.shared.computer.blocks.TileComputerBase.updateOutput(TileComputerBase.java:329)
	at dan200.computercraft.shared.computer.blocks.TileComputerBase.func_145845_h(TileComputerBase.java:198)
	at net.minecraft.world.World.func_72939_s(World.java:2477)
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:669)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:943)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:423)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:798)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:658)
	at java.lang.Thread.run(Unknown Source)