voila mon code :

$result = mysql_query("SELECT * FROM client WHERE client_login='$flogin' and client_password='$fpassword'");

$result2=mysql_num_rows($result);

il m'affiche cette erreur :


Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /usr/home/uctdz/public_html/client.php on line 27

comment remedier a cette erreur