Warning: Supplied argument is not a valid MySQL-Link resource in

har lavet nedenstående script men det giver en fejl meddelse:
Warning: Supplied argument is not a valid MySQL-Link resource in /home/administrator/www/sider/guestbook/create_entry.php on line 11


<?php
include("dbconnect.php");

if ($submit == "sign!")
{
    $query = "insert into guestbook
        (name, location, email, url, comments) values
        ('$name', '$location', '$email', '$url', '$comments')"
   
    ;
    mysql_error($query) or  ///line 11
                    die (mysql_error());
?>
<h2>thanks for signing</h2>
<h2><a href="wiev.php">wiev my guestbook</A></h2>

<?PHP
}
else
{
    include("sign.php");
}
?>

hvad betyder den fejl medd. og hvordan retter man den.

//krydset