StackableItems Error

11:11 PM [SEVERE] Could not pass event InventoryClickEvent to StackableItems v0.9.4.4
Caused by: java.lang.AbstractMethodError: com.mrcrayfish.furniture.tileentity.TileEntityBin.setMaxStackSize(I)V
	at org.bukkit.craftbukkit.v1_7_R1.inventory.CraftInventory.setMaxStackSize(CraftInventory.java:482)
	at haveric.stackableItems.SIPlayerListener.inventoryClick(SIPlayerListener.java:527)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.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.network.NetHandlerPlayServer.func_147351_a(NetHandlerPlayServer.java:2023)
	at net.minecraft.network.play.client.C0EPacketClickWindow.func_148833_a(SourceFile:32)
	at net.minecraft.network.play.client.C0EPacketClickWindow.func_148833_a(SourceFile:10)
	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)