Fatal error: Uncaught Error: Call to undefined function add_image_size() in /srv/users/serverpilot/apps/cartracktechnologies/public/wp-includes/media.php:5021 Stack trace: #0 /srv/users/serverpilot/apps/cartracktechnologies/public/wp-includes/class-wp-hook.php(303): _wp_add_additional_image_sizes('') #1 /srv/users/serverpilot/apps/cartracktechnologies/public/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array) #2 /srv/users/serverpilot/apps/cartracktechnologies/public/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #3 /srv/users/serverpilot/apps/cartracktechnologies/public/wp-settings.php(441): do_action('plugins_loaded') #4 /srv/users/serverpilot/apps/cartracktechnologies/public/wp-config.php(82): require_once('/srv/users/serv...') #5 /srv/users/serverpilot/apps/cartracktechnologies/public/wp-load.php(51): require_once('/srv/users/serv...') #6 /srv/users/serverpilot/apps/cartracktechnologies/public/wp-blog-header.php(13): require_once('/srv/users/serv...') #7 /srv/users/serverpilot/apps/cartrack in /srv/users/serverpilot/apps/cartracktechnologies/public/wp-includes/media.php on line 5021