Bukkit

What steps will reproduce the problem?
2013-03-16 11:22:40 [SEVERE] Could not pass event PlayerInteractEvent to HexRestrict v0.0.3
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:363)
    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_4_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:160)
    at ir.a(ItemInWorldManager.java:539)
    at iv.a(NetServerHandler.java:906)
    at net.smart.moving.playerapi.NetServerHandler.a(NetServerHandler.java:42)
    at fk.a(Packet15Place.java:79)
    at cg.b(TcpConnection.java:467)
    at iv.d(NetServerHandler.java:220)
    at iw.b(NetworkListenThread.java:57)
    at ht.b(DedicatedServerListenThread.java:34)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:981)
    at ho.r(DedicatedServer.java:309)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:857)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:744)
    at fy.run(ThreadMinecraftServer.java:16)
Caused by: java.lang.NoClassDefFoundError: me/ryanhamshire/GriefPrevention/GriefPrevention
    at me.HexCraft.HexListener.onPlayerInteract(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:361)
    ... 17 more

CONFIG:
BlocksRestrictedOutsideClaims:
- 239:*:Industrial TNT
ItemUseRestrictedInsideOtherClaims:
- 30183:Wrench
- 21257:PrototypeOmni Wrench
- 30140:Electric Wrench
- 4062:Wrench
- 5582:Screwdriver
- 5587:Sonic Screwdriver
- 12260:Safari Net
- 30124:Electric Treetap
- 30119:Electric Hoe
- 368:Ender Pearl
- 359:Shears

CraftBukkit version git-MCPC-Plus-jenkins-MCPC-Plus-244 (MC: 1.4.7) (Implementing API version 1.4.7-R1.1-SNAPSHOT)