Bukkit

I've been consistently getting this error in my console:

07.05 16:24:38 [Server] INFO ... 13 more
07.05 16:24:38 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301)
07.05 16:24:38 [Server] INFO at java.lang.reflect.Method.invoke(Unknown Source)
07.05 16:24:38 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
07.05 16:24:38 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
07.05 16:24:38 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
07.05 16:24:38 [Server] INFO at com.timcolonel.SignUtilities.Listeners.SUBlockListener.onSignChange(SUBlockListener.java:193)
07.05 16:24:38 [Server] INFO Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.block.CraftBlockState cannot be cast to org.bukkit.block.Sign
07.05 16:24:38 [Server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
07.05 16:24:38 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
07.05 16:24:38 [Server] INFO at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:551)
07.05 16:24:38 [Server] INFO at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
07.05 16:24:38 [Server] INFO at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:83)
07.05 16:24:38 [Server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
07.05 16:24:38 [Server] INFO at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
07.05 16:24:38 [Server] INFO at net.minecraft.server.Packet130UpdateSign.handle(SourceFile:41)
07.05 16:24:38 [Server] INFO at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:217)
07.05 16:24:38 [Server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1265)
07.05 16:24:38 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
07.05 16:24:38 [Server] INFO at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
07.05 16:24:38 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
07.05 16:24:38 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:303)
07.05 16:24:38 [Server] INFO org.bukkit.event.EventException
07.05 16:24:38 [Server] SEVERE Could not pass event SignChangeEvent to SignUtilities

do you know what trigger this error?

Are you still having this error?

Don't know what was causing it, and I had to take it off the server cause it was happening too often.