DBDGraph Plotter Help Needed !!!

I running the following script .=20
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#!/usr/bin/perl
use lib '/home/satyarth/GD_LIB';
use GD;
use DBD::Chart ;
use DBD::Chart::Plot;
                                                                           =
    =20
    my $img =3D DBD::Chart::Plot->new();
    my @xdataset =3D (1,2,3,4,5,6);
    my @ydataset =3D (3.2,1.1,5.5,6.2,0,7.9);
    $img->setPoints(\@xdataset, \@ydataset,'blue line');
                                                                           =
    =20
    $img->setOptions (
        horizMargin =3D> 75,
        vertMargin =3D> 100,
        title =3D> 'My Graph Title',
        xAxisLabel =3D> 'my X label',
        yAxisLabel =3D> 'my Y label' );

    open(FILE,'>output.gif');
    binmode FILE;
   print FILE $img->plot;
   close(FILE);
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When i run the script , file output.gif is created in the directory
but it is empty , doesnt contain anything .

Can you tell me why is this happening ? Where did i go  wrong ?=20
Also Im using DBD because i want to draw multiple plots on a single
graph . Is there any better way i can do it ?

Thanks in anticipation .=20

Regards=20
Satyarth Negi=20
+91-9899070583