error1

2012-08-24 14:48:06 [SEVERE] Could not pass event PlayerInteractEvent to Essentials
java.lang.IllegalStateException: Start block missed in BlockIterator
	at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:169)
	at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:231)
	at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:264)
	at org.bukkit.craftbukkit.entity.CraftLivingEntity.getLineOfSight(CraftLivingEntity.java:95)
	at org.bukkit.craftbukkit.entity.CraftLivingEntity.getTargetBlock(CraftLivingEntity.java:121)
	at com.earth2me.essentials.signs.SignPlayerListener.onPlayerInteract(SignPlayerListener.java:32)
	at sun.reflect.GeneratedMethodAccessor67.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:330)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
	at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:177)
	at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:147)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:619)
	at net.minecraft.server.Packet15Place.handle(SourceFile:58)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:276)
	at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
	at net.minecraft.server.ServerConnection.b(SourceFile:35)
	at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:608)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:244)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:501)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:419)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)