Maximum Oops. I thought that was a tutorial you'd just written and were posting it for others to use...

Looks like I didn't read the top part...
Anyway, if you're following the tut word-for-word, and it still doesn't work, it might be because the 3.02 topmenu_plugin.rco is encrypted. I'm not sure though, you might want to get confirmation from theaceoffire or pj1115.