I think you'll find that the error message means just what it says...
and that you'll need to make-install GD::Font.

You may find essentially this answer, phrased as a description of a dependancy, in the GD::Barcode::Code39 pos

Generally, I think you'll find perl's error messages fairly straight forward... despite the fact that some are a ...er ...ah... um, a tad arcane.

I see the 111 row and this is the code

  else {
        my($fW,$fH) = (GD::Font->Small->width, GD::Font->Small->height
+);
        my $iWidth = length($sPtn);
        #Bar Image
        ($oGd, $cBlack) = GD::Barcode::plot($sPtn, $iWidth, $iHeight, 
+$fH, 0);

        #String
        $oGd->string(GD::Font->Small, (length($sPtn)-$fW*(length($sTxt
+Wk)))/2, $iHeight - $fH,
                        $sTxtWk, $cBlack);
  }
[download]

As you see on code there is a GD::Font setting. Is for this question wich I search GD::Font module, but I doesn't exist on CPAN site. :(

At that point, Google is your friend:
Module Gd.Font ( http://gushee.net/matt/software/gd4o/doc/Gd.Font.html )

and -- as alternates -- read "GD::Text" (UWinnipeg) and "GD::Simple" (CPAN, Lincoln Stein) UpdateThanks, monarch, for noting bad link...
      but :-( after chasing the "gushee.net" links, I'm not so sure it's useful!

This is an odd error message, since GD::Font is in fact almost certainly already installed on your system. From the GD documentation:

GD defines the following four classes:

GD::Image

An image class, which holds the image data and accepts graphic primitive method calls.

GD::Font

A font class, which holds static font information and used for text rendering.

GD::Polygon

A simple polygon object, used for storing lists of vertices prior to rendering a polygon into an image.

GD::Simple

A "simple" class that simplifies the GD::Image API and then adds a set of object-oriented drawing methods using turtle graphics, simplified font handling, ability to work in polar coordinates, HSV color spaces, and human-readable color names like "lightblue". Please see GD::Simple for a description of these methods.

This implies that either GD is not being loaded correctly (or not in time), or you have a severely broken and/or ancient installation of it. Since the first of those is much easier to correct than the second, you should probably try fixing it first: simply add use GD; to the beginning of your program, and see if your troubles continue (or change to the unpleasant Can't locate GD.pm in @INC). If they do, consider upgrading your GD install.

Thank you ALL,

  I've resolved my problem. 

I've installed the GD module and now it Work very well.

Many Thanks
Joe

Oops...

The solution :

URL : http://www.giobis.it/cgi-bin/ean1.pl?codice=520366500186