[appfuse-user] Tutorial Not Working Properly

[Otniel]

I'm having problem in follow persistence tutorial at 
http://www.appfuse.org/display/APF/Persistence#Persistence-createschema.
I'm extending the BaseObject into my class like thid
import org.appfuse.model.BaseObject;
public class Person extends BaseObject{
...
}
But i found thats an error in my IDE (NetBeans)
How to resolve that.
Regards
Otniel