You may find it helpful to add this line to your index.pl script while debugging. Remove it when all the errors have been fixed

use CGI::Carp 'fatalsToBrowser';

Using CGI

package newindex;
use strict;
use CGI ':standard';

sub getTitle {
  return "workers";
}

sub getContent {
  my $cgi = shift;    
  my $hashref = {
      'Adam'  => 'Eve',
      'Clyde' => 'Bonnie',
  };  
  
  my @rows;
  push @rows,th(['Column 1', 'Column 2',]);
  for (sort keys %$hashref){
    push @rows,td([$_ , $hashref->{$_}])
  }
  
  return table({ -border => 1 },
     caption('My Table 1'),
     Tr({-align=>'center',-valign=>'top'}, \@rows )
  );
}

1;
[download]

Or better using Template

package newindex;
use strict;
use Template;

sub getTitle {
  return "workers";
}

sub getContent {
  my $cgi = shift;    
  my $hashref = {
      'Adam'  => 'Eve',
      'Clyde' => 'Bonnie',
  };  
   
  my %data=();
  $data{'header'} = ['Column 1','Column 2'];

  for (sort keys %$hashref){
    push @{$data{'rows'}},{ key=>$_ , value=>$hashref->{$_} };
  }
    
  my $TMPL = <<'EOT';
    <table border="1" cellspacing="0" cellpadding="5">
    <tr>
      [% FOREACH col IN header %]
        <th>[% col %]</th>
      [% END %]
    </tr>
    [% FOREACH record IN rows %]
       <tr>
         <td>[% record.key %]</td>
         <td>[% record.value %]</td>
       </tr>
    [% END %]
    </table>
EOT
  
  my $template = Template->new();
  my $html;
  $template->process(\$TMPL, \%data, \$html)
     || die "Template process failed: ", $template->error(), "\n";
  return $html;  

}

1;
[download]

updated : added header
poj