api instagram در php

ایراد این کد چیست؟

$client_id = '';
$client_secret ='';
$redirect_uri = 'http://localhost';
$code ='Enter your code manually';
$url = "https://api.instagram.com/oauth/access_token";
$access_token_parameters = array(
    'client_id'                =>     $client_id,
    'client_secret'            =>     $client_secret,
    'grant_type'               =>     'authorization_code',
    'redirect_uri'             =>     $redirect_uri,
    'code'                     =>     $code);
$curl = curl_init($url); // we init curl by passing the url
curl_setopt($curl,CURLOPT_POST,true); // to send a POST request
curl_setopt($curl,CURLOPT_POSTFIELDS,$access_token_parameters); // indicate the data to send
curl_setopt($curl, CURLOPT_RETURNTRANSFER, ۱); // to return the transfer as a string of the return value of curl_exec() instead of outputting it out directly.
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); // to stop cURL from verifying the peer's certificate.
$result = curl_exec($curl); // to perform the curl session
curl_close($curl); // to close the curl session
echo "<pre>";
print_r( json_decode($result));
echo "</pre>";

این ارور رو میده

stdClass Object
(
    [error_type] => OAuthException
    [code] => 400
    [error_message] => Matching code was not found or was already used.
)