ClassNotFoundException, first plugin, need help

Ok, so I'm working on my first real plugin, and upon starting the server I get this:

Code:

2011-08-05 00:27:26 [SEVERE] Could not load 'plugins\Test.jar' in folder 'plugins':
java.lang.ClassNotFoundException: me.williamsson.test
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:36)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:168)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:207)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:130)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:128)
    at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:97)
    at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:51)
    at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:132)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:335)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)

Don't understand anything..

Posting my code:
http://pastebin.com/p7YVK1dq Preventer.jar
http://pastebin.com/a5PvxUKG PreventerBlockListener

Yeah, I'll setup a github when I aint as tired as I'm now..

Also, i have some questions in the comments, lif someone would like to answer them I'd be glad

 

Your plugin.yml file is wrong. The "main" option should be "me.williamsson.preventer.Preventer" but it looks like you've set it to "me.williamsson.test".

 

Note to self: Don't do this when tired.

Fixed, but getting the same error

YML file
name: Preventer
main: me.williamsson.preventer.Preventer
version: 0.1

And the code uses package me.williamsson.preventer.Preventer;

 

You changed the package name? Before it was only me.williamsson.preventer.

 

yeah, copy-pasting it now: me.williamsson.preventer.Preventer

 

If your package is me.williamsson.preventer and your class is Preventer, then your "main" class listed in the plugin.yml is me.williamsson.preventer.Preventer.

 

Aaah, I can see clearly now!
Huge thanks to you , It would probably taken me a couple of days figuring that out D:
Thanks!