Help please

I updated from 1.5 alpha to 1.5 beta build (the newest)
In your first build i had no problems with my plugins, but now i got this error:

Code:

2013-05-01 14:09:35 [SEVERE] Could not load 'plugins/PvP Plugin.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: org.bukkit.plugin.IllegalPluginAccessException: Plugin attempted to register task while disabled
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:182)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
    at org.bukkit.craftbukkit.v1_5_R2.CraftServer.loadPlugins(CraftServer.java:239)
    at org.bukkit.craftbukkit.v1_5_R2.CraftServer.<init>(CraftServer.java:217)
    at net.minecraft.server.v1_5_R2.PlayerList.<init>(PlayerList.java:55)
    at net.minecraft.server.v1_5_R2.DedicatedPlayerList.<init>(SourceFile:11)
    at net.minecraft.server.v1_5_R2.DedicatedServer.init(DedicatedServer.java:105)
    at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:381)
    at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
Caused by: org.bukkit.plugin.IllegalPluginAccessException: Plugin attempted to register task while disabled
    at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftScheduler.validate(CraftScheduler.java:394)
    at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftScheduler.runTaskTimerAsynchronously(CraftScheduler.java:137)
    at de.milkaselnuss.Plugin.Plugin.<init>(Plugin.java:203)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:178)
    ... 9 more

I don't know whats the mistake because it worked in the other builds with the same code.

 

Could not load 'plugins/PvP Plugin.jar' in folder 'plugins'
Plugin is outdated, and does not work for that build.

 

Yeah, but i don't know why. I have no wrong imports etc.
I really don't know whats going on

 

That doesn't actually help me...

 

Beta build breaks the plugin's code... therefore, you have to wait the author to update it -,-

 

But I AM the author and theres no mistake in my code (well i don't find one^^)

 

Maybe bukkit changed some codes and you have to make some changes in ur codes

 

Where can I see the changes made in Bukkit???
Because I hae 3000 lines of code^^ so that could be hard to find the right lines there

 

go plugin development, paste your code.