MY SERVER LOG

2012-10-16 16:45:25 [WARNING] Unexpected exception while parsing console command "manload"
org.bukkit.command.CommandException: Unhandled exception executing command 'manload' in plugin GroupManager v2.0 (2.9.4) (Phoenix)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:498)
	at org.bukkit.craftbukkit.CraftServer.dispatchServerCommand(CraftServer.java:490)
	at net.minecraft.server.DedicatedServer.ai(DedicatedServer.java:249)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:214)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:473)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:405)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.IllegalArgumentException
	at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:230)
	at org.anjocaido.groupmanager.GroupManager.onCommand(GroupManager.java:1704)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	... 8 more
Caused by: java.lang.NullPointerException
	at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:163)
	... 10 more