Fatal error: Uncaught Error: Class "WP_REST_Controller" not found in /usr/home/apostolowie/domains/apostolowie.pl/public_html/wp-content/plugins/nextgen-gallery/src/REST/Admin/AttachToPost.php:14
Stack trace:
#0 {main}
  thrown in /usr/home/apostolowie/domains/apostolowie.pl/public_html/wp-content/plugins/nextgen-gallery/src/REST/Admin/AttachToPost.php on line 14