Can't use Reverse Code

I can’t use the function Reverse Code (Code -> Java -> Reverse Code) for JBuilder project. It don’t do anything. But I can create new project to reverse code from JBuilder project and use Instant Reverse.
Can you help me ?
I import JBuilder Project name, path for source and path for class, but it don’t do anything.
I use VP Professional 3.1 (evaluation), JBuilder 9