DBDGraph Plotter Help Needed !!!

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

    open(FILE,'>output.gif');
    binmode FILE;
   print FILE $img->plot;
   close(FILE);
---------------------------------------------------------------

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 ? 
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 . 

Regards 
Satyarth Negi 
+91-9899070583

• DBDGraph Plotter Help Needed !!! by Satyarth Negi
• Perl Graphics Help by Satyarth Negi