Fatal error: Uncaught Error: Call to undefined function wp_get_additional_image_sizes() in /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/media.php:63 Stack trace: #0 /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/media.php(266): image_constrain_size_for_editor() #1 /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/media.php(953): image_downsize() #2 /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/media.php(1028): wp_get_attachment_image_src() #3 /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/post-template.php(1624): wp_get_attachment_image() #4 /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/post-template.php(1685): wp_get_attachment_link() #5 /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/class-wp-hook.php(287): prepend_attachment() #6 /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/plugin.php(212): WP_Hook->apply_filters() #7 /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/post-template.php(25 in /var/www/vhosts/web437.anna.servertools24.de/html/wp-includes/media.php on line 63