i have something like:

    #!/usr/bin/perl

use strict;
use warnings;
use CGI::Simple;
use DBI;

my $cgi = CGI::Simple->new;


if ($cgi->param('selid'))
{

    print $cgi->header, <<HTML;
    <br/>this is SELECT 
     HTML
}
elsif ($cgi->param('delid'))
{

    print $cgi->header, <<HTML; 
    <b>this is DELETE</b>
    HTML
}
elsif ($cgi->param('upid'))
{
    print $cgi->header, <<HTML; 
    <b>this is UPDATE</b>
    HTML
}

when i run this i get an error like:

Error message: Can't find string terminator " HTML" anywhere before EOF at C:/xampp/htdocs/perl/action.pl line 14. ,

and when give space between << and HTML;

like :print $cgi->header, << HTML;

error changes to:

Error message: Can't find string terminator " " anywhere before EOF at C:/xampp/htdocs/perl/action.pl line 14. ,

what would be the reason for this?

note: parameters are passed from another page('selid' or 'delid' or 'upid')