Oauthpermissionexception

Hi, i'm trying to use your code when i execute
 `client.tags.media.recent('spring', function(err, data) {
  if (!err) {
    console.log(data);
  } 
});`

i get an error on the console saying error 400
Oauthpermissionexception.

what am i doing wrong ? 
thank you.
