The above code gives me this error: Can't locate object method "descr" via package "title" (perhaps you forgot to load "title"?)

I dont think there's any hidden magic here. This simply means that Perl can't find a method with name "descr" for your objects of class "title". I assume that is indeed the class for your objects? Apparently, the method "title" does exist.

So... is there a sub "descr" in package "title"?