Bandwidth Optimization options locked

I’m running Drupal 8.1.5 site. At /admin/config/development/performance the “Bandwidth Optimization” settings for “Aggregate CSS Files” and “Aggregate Javascript files” are disabled, so I cannot change their state. Can you help me, please. http://es.tinypic.com/view.php?pic=280jhvt&s=9#.V_5gE-jhCUk my config: http://es.tinypic.com/view.php?pic=2hxste&s=9#.V_5gZOjhCUk Best Regards Drupal version:  Drupal 8.x Source: https://www.drupal.org/taxonomy/term/4/feed

Facebook Instant Articles module requires the facebook-instant-articles-sdk-php Drupal

Hi, I installed in drupal 7 the module Facebook Instant Articles, but when I activate it show me this error: The Facebook Instant Articles module requires the facebook-instant-articles-sdk-php library. I downloaded the facebook-instant-articles-sdk file from https://github.com/facebook/facebook-instant-articles-sdk-php, I unzip it and upload it to my site[…]