at C:\Users\Lucca\Documents\NetBeansProjects\PERL scripts\perl\MioDreamcar.pl line 17. is telling you the line and file where the error occured; in this case the error occurred when you tried to LOAD Da_corsa.

The error message Can't locate object method "class" via package "Da_corsa" (perhaps you forgot to load "Da_corsa"?) is telling you that Perl still can't find a valid package of that name. The reason is probably that you are forgetting to return a true value at the end of your package, i.e. your module Da_corsa.pm should be like:

package Da_corsa;
use strict;
use warnings;

sub foo {
    return 'bar';
}

1; # return true
[download]

In your original post the other two packages return true but Da_corsa doesn't.

Given the various comments and such in your latest example, once your module returns true, you might have success with:

use lib "C:/Users/Lucca/Documents/NetBeansProjects/perlpm";
use Da_corsa;
[download]

Hope this helps!