Cut your program down to a mimimal working page like shown below then add back the db/table stuff. Try writing the error log to /tmp, cgi directories are not normally writeable for the webserver process for security reasons.

#!/usr/bin/perl
use strict;
use CGI;
use CGI::Carp 'fatalsToBrowser'; # remove after testing

my $q = CGI->new;
print $q->header(-nph=>1);
my $style = get_style();
print $q->start_html(
  -title => "XREF",
  -style => {-code => $style},
);
print $q->h1 ("ACTIV INSTRUMENT TABLE DATA"),
$q->pre('Table Here'),$q->end_html();


sub get_style {
  return 'body { color:red };';
}
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