Problem with web start

here is what i have:

1. My game 2. the applet for my game 3. a web browser

here is what i get when i run the applet in my browser:

CacheEntry[file:/C:/Users/Joel%20-%20School/Documents/Mineoria/dist/launch.jnlp]: updateAvailable=true,lastModified=Thu Jun 13 08:00:12 PDT 2013,length=1609 java.lang.NullPointerException at sun.plugin2.applet.JNLP2Manager.initialize(Unknown Source) at sun.plugin2.main.client.PluginMain.initManager(Unknown Source) at sun.plugin2.main.client.PluginMain.access$200(Unknown Source) at sun.plugin2.main.client.PluginMain$ Source) at Source) Error while initializing manager: java.lang.NullPointerException, bail out