"Prototype mismatch: sub main::head ($) vs none"

##</code><code>##

  
use LWP::Simple qw(!head);
use CGI qw(:standard);    # then only CGI.pm defines a head

##</code><code>##

LWP::Simple::head($url)

##</code><code>##

#!/usr/bin/perl 

use strict;
use warnings;
use LWP::Simple qw(!head);
use CGI qw/:standard/;
use CGI::Carp qw(fatalsToBrowser);
head();

print header, start_html("test");
my $url    = 'http://www.perlmonks.net';
my $geturl = url_param('geturl');
my $commentid;

if ( defined( $_ = $geturl ) ) {
    &get_url;
}
else {
    &get_site;
    &print_form;

}

sub get_url {
    print qq(<form name="geturl" name="geturl" method="get" action="wp.pl">);
    print qq(URL: <input type="text" name="geturl">);
    print qq(<input type="submit" name="submiturl"></form>);
}

sub print_form {
    print "test 1";
}

sub get_site {
    my $content = get($geturl);
    print "test\n";
}