I am getting some CGI errors when I try to run this code. The code I found is straight out of a book, as I'm trying to learn how to run a poll on my website.

To see the CGI errors, please check them out here: http://www.forexballot.com/groundhog.pl

Here is my code:

my %groundhog_map = # hash that maps groundhog names to labels
(
"jimmy" => "Jimmy the groundhog (Sun Prairie, Wisconsin)",
"phil" => "Punxsutawney Phil (Punxsutawney, Pennsylvania)"
);

print header (),
    start_html (-title => "Vote for Your Favorite Groundhog",
                 -bgcolor => "white");
                 
# Dispatch to the proper action based on user selection

my $choice = lc (param ("choice")); #get choice, lowercased

if ($choice eq "")                #initial script invocation
{
    display_poll_form(\%groundhog_map);
}
elsif ($choice eq "submit")     #tally vote, show current results
{
    process_vote (\%groundhog_map, 1, param ("name"));
}
elsif ($choice eq "results")    #just show current results
{
    process_vote (\%groundhog_map, 0);
}
else
{
print p (escapeHTML ("Logic error, unknown choice: $choice"));
}

print end_html();




sub display_poll_form
{
my $map_ref = shift;  #groundhog name/label map

    print start_form (-action => url()),
        p ("Which groundhog is your favorite?"), #pose question
        radio_group (-name => "name",
                     -values => [ sort (keys (%{$map_ref})) ],
                     -default => "[NO DEFAULT]",
                     -override => 1,
                     -labels => $map_ref,
                     -linebreak => 1), #display buttons vertically
                     br(),
                     submit (-name => "choice", -value => "Submit"),
                     end_form ();
        #add link allowing user to see current results without voting
        print hr(),
            a ({-href => url() . "?choice=results"}, "See current resu
+lts");
}




CREATE TABLE groundhog
(
    name      CHAR(10) NOT NULL,                /* groundhog name */
    tally     INT UNSIGNED NOT NULL DEFAULT 0 /* number of votes */
)

INSERT INTO groundhog (name) VALUES ('jimmy'), ('phil')




sub process_vote
{
my ($map_ref, $tally_vote, $name = @_;
my ($dbh, $rs_ref, $row_ref, $sum, @table_row);

    $dbh = WebDB::connect ();
    if ($tally_vote)
    {
        #make sure name was given and that it's one of the legal names
        if (defined ($name) && defined ($map_ref->{$name}))
        {
            $dbh->do ("UPDATE groundhog SET tally = tally + 1 WHERE na
+me = ?",
                        undef, $name);
            print p ("Thank you for voting!");
        }
        else
        {
            print p ("No vote was cast; did you make a choice?");
        }
    }
    
print p (" The current results are: ");
#retrieve result set as a reference to a matrix of names and tallies
$rs_ref = $dbh->selectall_arrayref ("SELECT name, tally FROM groundhog
+");
$dbh->disconnect ();

#compute sum of vote tallies
$sum = 0;
map { $sum += $_->[1] } @{$rs_ref};
if ($sum == 0) #no results!
    {
        print p ("No votes have been cast yet");
        return;
    }

#Construct table of results: header line first, then contents.
#For each groundhog, show votes as a tally and as a percentage
#of the total number of votes.  Right-justify numeric values.
push (@table_row, Tr (th ("Groundhog"), th ("Votes"), th ("Percent")))
+;
foreach $row_ref (@{$rs_ref})
{
    my $label = $map_ref->{$row_ref->[0]};  #map name to descriptive l
+abel
    my $percent = sprintf ("%d%%", (100 * $row_ref->[1]) / $sum);
    push (@table_row, Tr (
        td (escapeHTML ($label)),
        td ({-align => "right"}, $row_ref->[1]),      # tally
        td ({-align => "right"}, $percent)            # % of total
    ));
}
print table (@table_row);
}
[download]