php - Facebook app permissions error -

i have code facebook web app:

<?php if (!$user_profile) { ?>         <div class="fb-login-button" data-perms="email,user_birthday,publish_stream">login facebook</div>     <?php } else { ?>          user profile         <pre>         <?php //print htmlspecialchars(print_r($user_profile, true)) ?>         </pre>            <?php echo $user_profile['name']; ?>          <?php         $data = array("message" => "hello woghfd!");         $status = $facebook->api("/me/feed", "post", $data);          //echo $user;          ?>     <?php }  

i have code, simple thing post users wall. know need permission of publish_stream, ive included in button (at top) when user visits site error:

fatal error: uncaught oauthexception: (#200) user hasn't authorized application perform action

now when user logs out of facebook via facebook, , logs in using login button, works ok, how can set dioesnt show error when first visiting site??? confusing!

thanks :)

your if statement doesn't check if user has authenticated app:

if (!$user_profile) 

to check if user has authenticated, this:

        try {             $fb_userid = $facebook->getuser();              // user authenticated continue normally...          } catch (facebookapiexception $e) {              // user not authenticated, else...          }