Fatal error: Uncaught Error: Class 'WP_REST_Controller' not found in /var/www/stockinger.dk/public_html/wp-content/plugins/ithemes-sync/src/REST/Auth.php:19 Stack trace: #0 /var/www/stockinger.dk/public_html/wp-content/plugins/ithemes-sync/load.php(30): require_once() #1 /var/www/stockinger.dk/public_html/wp-content/plugins/ithemes-sync/init.php(52): require('/var/www/stocki...') #2 /var/www/stockinger.dk/public_html/wp-settings.php(254): include_once('/var/www/stocki...') #3 /var/www/stockinger.dk/public_html/wp-config.php(90): require_once('/var/www/stocki...') #4 /var/www/stockinger.dk/public_html/wp-load.php(37): require_once('/var/www/stocki...') #5 /var/www/stockinger.dk/public_html/wp-blog-header.php(12): require_once('/var/www/stocki...') #6 /var/www/stockinger.dk/public_html/index.php(17): require('/var/www/stocki...') #7 {main} thrown in /var/www/stockinger.dk/public_html/wp-content/plugins/ithemes-sync/src/REST/Auth.php on line 19