material.MaterialData cannot be cast to org.bukkit.material.Tree

[smithy285]

2012-10-20 12:50:08 [sEVERE] Could not pass event BlockBreakEvent to mcMMO

java.lang.ClassCastException: org.bukkit.material.MaterialData cannot be cast to org.bukkit.material.Tree

    at com.gmail.nossr50.skills.gathering.WoodCutting.woodCuttingProcCheck(WoodCutting.java:292)

    at com.gmail.nossr50.skills.gathering.WoodCutting.woodcuttingBlockCheck(WoodCutting.java:384)

    at com.gmail.nossr50.listeners.BlockListener.onBlockBreak(BlockListener.java:202)

    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:302)

    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)

    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:484)

    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:469)

    at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:229)

    at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:179)

    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:548)

    at net.minecraft.server.Packet14BlockDig.handle(SourceFile:43)

    at net.minecraft.server.NetworkManager.b(NetworkManager.java:262)

    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:119)

    at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:97)

    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:651)

    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:525)

    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Please help!