PP Error

2013-03-21 14:54:02 [INFO] [PotionProtection] Enabling PotionProtection v0.9b
2013-03-21 14:54:02 [INFO] [PotionProtection] Using potion ID 16391 with size 10!
2013-03-21 14:54:02 [INFO] [PotionProtection] Using potion ID 16395 with size 20!
2013-03-21 14:54:02 [INFO] [PotionProtection] Using potion ID 16397 with size 30!
2013-03-21 14:54:02 [INFO] [PotionProtection] Using potion ID 16399 with size 50!
2013-03-21 14:54:02 [INFO] [PotionProtection] Using potion ID 16407 with size 100!
2013-03-21 14:54:02 [INFO] [PotionProtection] WARNING: No worlds enabled in worlds.yml!!!
2013-03-21 14:54:02 [INFO] [PotionProtection] Disabling PotionProtection v0.9b
2013-03-21 14:54:02 [SEVERE] Error occurred while enabling PotionProtection v0.9b (Is it up to date?)
org.bukkit.plugin.IllegalPluginAccessException: Plugin attempted to register com.ballzofsteel.PotionProtection.PPListeners@10afa1ee while not enabled
	at org.bukkit.plugin.SimplePluginManager.registerEvents(SimplePluginManager.java:499)
	at com.ballzofsteel.PotionProtection.PotionProtection.onEnable(PotionProtection.java:66)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
	at org.bukkit.craftbukkit.v1_5_R1.CraftServer.loadPlugin(CraftServer.java:282)
	at org.bukkit.craftbukkit.v1_5_R1.CraftServer.enablePlugins(CraftServer.java:264)
	at net.minecraft.server.v1_5_R1.MinecraftServer.j(MinecraftServer.java:303)
	at net.minecraft.server.v1_5_R1.MinecraftServer.e(MinecraftServer.java:282)
	at net.minecraft.server.v1_5_R1.MinecraftServer.a(MinecraftServer.java:242)
	at net.minecraft.server.v1_5_R1.DedicatedServer.init(DedicatedServer.java:150)
	at net.minecraft.server.v1_5_R1.MinecraftServer.run(MinecraftServer.java:381)
	at net.minecraft.server.v1_5_R1.ThreadServerApplication.run(SourceFile:573)