Error

2013-01-10 15:06:00 [SEVERE] Could not load 'plugins/OreNotifier.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.ClassCastException: class foldager.Orelis
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:184)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
    at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugins(CraftServer.java:235)
    at org.bukkit.craftbukkit.v1_4_6.CraftServer.<init>(CraftServer.java:213)
    at net.minecraft.server.v1_4_6.PlayerList.<init>(PlayerList.java:52)
    at net.minecraft.server.v1_4_6.DedicatedPlayerList.<init>(SourceFile:11)
    at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:104)
    at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:399)
    at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.ClassCastException: class foldager.Orelis
    at java.lang.Class.asSubclass(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:174)
    ... 9 more