iconomy hook in

2011-04-06 12:28:37 [SEVERE] tried to access class com.nijiko.coelho.iConomy.iConomy$Listener from class com.nijiko.coelho.iConomy.iConomy loading iConomy v4.65 (Is it up to date?)
java.lang.IllegalAccessError: tried to access class com.nijiko.coelho.iConomy.iConomy$Listener from class com.nijiko.coelho.iConomy.iConomy
	at com.nijiko.coelho.iConomy.iConomy.onEnable(iConomy.java:174)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:118)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:514)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:216)
	at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:94)
	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:72)
	at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:215)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:202)
	at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:142)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:257)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:375)