Fatal error: Uncaught Error: Call to undefined function wp_is_serving_rest_request() in /home/bmpservi/copy/ristrettogmbh/wp-content/plugins/contact-form-7/includes/submission.php:54 Stack trace: #0 /home/bmpservi/copy/ristrettogmbh/wp-content/plugins/contact-form-7/includes/controller.php(17): WPCF7_Submission::is_restful() #1 /home/bmpservi/copy/ristrettogmbh/wp-includes/class-wp-hook.php(322): wpcf7_control_init() #2 /home/bmpservi/copy/ristrettogmbh/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #3 /home/bmpservi/copy/ristrettogmbh/wp-includes/plugin.php(565): WP_Hook->do_action() #4 /home/bmpservi/copy/ristrettogmbh/wp-includes/class-wp.php(418): do_action_ref_array() #5 /home/bmpservi/copy/ristrettogmbh/wp-includes/class-wp.php(813): WP->parse_request() #6 /home/bmpservi/copy/ristrettogmbh/wp-includes/functions.php(1336): WP->main() #7 /home/bmpservi/copy/ristrettogmbh/wp-blog-header.php(16): wp() #8 /home/bmpservi/copy/ristrettogmbh/index.php(17): require('/home/bmpservi/...') #9 {main} thrown in /home/bmpservi/copy/ristrettogmbh/wp-content/plugins/contact-form-7/includes/submission.php on line 54