2012-01-21 18:50:38 [SEVERE] Could not pass event org.bukkit.event.player.PlayerInteractEvent to PreciousStones
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$103.execute(JavaPluginLoader.java:1028)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:57)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:327)
at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:183)
at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:153)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:845)
at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:192)
at net.minecraft.server.Packet18ArmAnimation.handle(SourceFile:38)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:100)
at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:587)
at net.minecraft.server.NetworkListenThread.a(SourceFile:108)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:536)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:434)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.bukkit.plugin.java.JavaPluginLoader$103.execute(JavaPluginLoader.java:1026)
... 14 more
Caused by: java.lang.IllegalStateException: Start block missed in BlockIterator
at org.bukkit.util.BlockIterator.(BlockIterator.java:167)
at org.bukkit.util.BlockIterator.(BlockIterator.java:254)
at org.bukkit.util.BlockIterator.(BlockIterator.java:287)
at org.bukkit.craftbukkit.entity.CraftLivingEntity.getLineOfSight(CraftLivingEntity.java:84)
at org.bukkit.craftbukkit.entity.CraftLivingEntity.getTargetBlock(CraftLivingEntity.java:110)
at net.sacredlabyrinth.Phaed.PreciousStones.listeners.PSPlayerListener.onPlayerInteract(PSPlayerListener.java:178)
... 18 more

This is an error with bukkit's getTargetBlock function when the person is standing above the block limit (128). You can ignore it, it doesn't have any negative effects other than the error.

ok thank you :)