Hi ,

I am also facing same problem,
Please let us know if any body knows this issue.

Thanks in advance

first check yours api key status it is active or not then set the call back url in phpFlickr2.2.0 u already have a auth.php file copy paste this script u get the authToken set it it will never expire

$api_key = "XXXXXXXX";
$api_secret = "XXXXXXXXX";
$permissions = "write";
ob_start();
require_once("path to the phpflickr class");

$f = new phpFlickr($api_key, $api_secret);

if (empty($_GET['frob'])) {
$f->auth($permissions, false);
} else {
$token = $f->auth_getToken($_GET['frob']);
echo "use this token to authenticate: "$token['token'];
}
use this to get the auth token when u get it set it
i recommend to set token in yours include file
using function

$f->setToken("YOUR-TOKEN-NUMBER-GOES-HERE");

set your url where u redirect it in my case i set it as
http://localhost/php_flickr/phpFlickr/somefile.php