Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "Akismet_REST_API" not found in /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/class-wp-hook.php:324 Stack trace: #0 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #1 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/rest-api.php(628): do_action('rest_api_init', Object(WP_REST_Server)) #3 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/rest-api.php(452): rest_get_server() #4 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/class-wp-hook.php(324): rest_api_loaded(Object(WP)) #5 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array) #6 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #7 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/class-wp.php(418): do_action_ref_array('parse_request', Array) #8 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/class-wp.php(818): WP->parse_request('') #9 /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/functions.php(1342): WP->main('') #10 /home/srv53479/domains/gd-industrie.de/public_html/wp-blog-header.php(16): wp() #11 /home/srv53479/domains/gd-industrie.de/public_html/index.php(17): require('/home/srv53479/...') #12 {main} thrown in /home/srv53479/domains/gd-industrie.de/public_html/wp-includes/class-wp-hook.php on line 324