I'm currently trying to write some CGI scripts for a website that i'm developing for work. I'm a little new at this, so everything is a 'suck it and see' approach.

Anyway, I've gotten so far, but am stuck on the following. Its a (rather simple) CGI script called from a html form. 

#!/usr/bin/perl

use CGI;


my $query= new CGI;

my $pdb_file = $query->param('pdbcode');

print $query->header(-type => 'text/html');

print $query->start_html(-title => "Secondary Structure Analysis");

MainProgram($pdb_file);

$query->end_html( );

#######################################################

# 'main' subroutine

sub MainProgram
{

    my($pdb_file) = @_;
    my $dssp = ".dssp";
    my $dsspdir = "http:/mywebsite/datafiles/";
    my $pdbcode = substr($pdb_file, 0, 4);
    my $dssp_file = "$dsspdir$pdbcode$dssp";

    print $query->('dssp file used is $dssp_file');
 
}

[download]
When I submit data to the preceding form, this script returns a blank page. And when I try running the script from the command line I get the following error

Not a CODE reference at ./script.cgi line 45.

Could anyone please suggest as to what might be going on? Any help much appreciated.

In reply to CGI script query by Angharad

Title:
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and:  <code> code here </code>
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