Having trouble uninstalling an application...

I downloaded the trial version of Visual Arts Automatic Wallpaper changer I and decided I don't want it. I connected the Storm to my PC and ran the Application Loader from Desktop Manager. When I click on the app "myWallPaper" to remove the application, it won't uncheck to uninstall the program. Is there another method to remove this program??

The software is located in the software section on this site. I can't post the URL until I have 10 posts as it seems...

ok, so I go into options the advanced and remove the application that way. I reboot the phone and now I get this error: "Uncaught exception: java.lang.NullPointerException"

Any ideas?

cant you just highlight the icon hit the blackberry key and then select delete?