Error update

<?php
 
/*
1   s_name 
    2   s_url  
    3   s_email    
    4 s_desc   
    5   s_key  
    6   s_close
    7   s_close_text   
    8   s_copy

 
/ $req = $bdd->query('SELECT * FROM config ');$donnees= $req->fetch();$req->closeCursor(); if(isset($_POST['savesett'])){        $s_name = $_POST['s_name'];        $s_url = $_POST['s_url'];        $s_email = $_POST['s_email'];        $s_desc = $_POST['s_desc'];        $s_key = $_POST['s_key'];        $s_close = $_POST['s_close'];        $s_close_text = $_POST['s_close_text'];        $s_copy = $_POST['s_copy'];                 $req = $bdd->prepare('UPDATE config SET        s_name= :s_name,        s_url= :s_url,        s_email= :s_email,        s_desc= :s_desc,        s_key=: s_key,        s_close= :s_close,        s_close_text= :s_close_text,        s_copy= :s_copy         ');    $req->execute(array(         's_name' => $s_name,    's_url' => $s_url,    's_email' => $s_email,    's_desc' => $s_desc,    's_key' => $s_key,    's_close' => $s_close,    's_close_text' => $s_close_text,    's_copy' => $s_copy));         $resultat = $req->fetch();                if (isset($resultat)){                    echo'<div class"success">l operation a bien reussit</div>';                                     refresh('admincp.php',3);                }            }?>

PDOException: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens in C:\wamp\www\blog\admin\setting.php on line (ou il ya la 2 eme  fetch )