Antishare error

2014-03-29 13:33:06 [SEVERE] Could not pass event BlockPlaceEvent to AntiShare v5.5.2
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:112)
	at net.minecraft.server.v1_6_R3.ItemBlock.processBlockPlace(ItemBlock.java:89)
	at net.minecraft.server.v1_6_R3.ItemBlock.interactWith(ItemBlock.java:73)
	at net.minecraft.server.v1_6_R3.ItemStack.placeItem(ItemStack.java:79)
	at net.minecraft.server.v1_6_R3.PlayerInteractManager.interact(PlayerInteractManager.java:389)
	at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:630)
	at net.minecraft.server.v1_6_R3.Packet15Place.handle(SourceFile:58)
	at net.minecraft.server.v1_6_R3.NetworkManager.b(NetworkManager.java:296)
	at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
	at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
	at net.minecraft.server.v1_6_R3.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:592)
	at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
	at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NoSuchFieldError: DOUBLE_PLANT
	at com.turt2live.materials.shade.antishare.MaterialAPI.isDroppedOnBreak(MaterialAPI.java:382)
	at com.turt2live.antishare.ASListener.onBlockPlace(ASListener.java:766)
	at sun.reflect.GeneratedMethodAccessor166.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:425)
	... 19 more