CreeperHeal Error

06:12 PM [SEVERE] Could not pass event BlockPhysicsEvent to CreeperHeal v6.7.2
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R1.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.GeneratedMethodAccessor125.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:328)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:47)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:487)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:472)
	at net.minecraft.world.World.func_147460_e(World.java:1079)
	at net.minecraft.world.World.func_147459_d(World.java:1024)
	at net.minecraft.world.World.func_147444_c(World.java:989)
	at net.minecraft.world.World.markAndNotifyBlock(World.java:844)
	at net.minecraft.item.ItemStack.func_77943_a(ItemStack.java:249)
	at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:487)
	at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:869)
	at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)
	at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)
	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:206)
	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:173)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:953)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:783)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:646)
	at java.lang.Thread.run(Unknown Source)