Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "_return_false" not found or invalid function name in /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/class-wp-hook.php:308
Stack trace:
#0 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/plugin.php(205): WP_Hook->apply_filters(true, Array)
#1 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/rest-api/class-wp-rest-server.php(302): apply_filters('rest_jsonp_enab...', true)
#2 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/rest-api.php(410): WP_REST_Server->serve_request('/')
#3 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/class-wp-hook.php(308): rest_api_loaded(Object(WP))
#4 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)
#5 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/plugin.php(565): WP_Hook->do_action(Array)
#6 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/class-wp.php(399): do_action_ref_array('parse_request', Array)
#7 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/class-wp.php(780): WP->parse_request('')
#8 /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/functions.php(1332): WP->main('')
#9 /customers/1/0/1/okosongoro.com/httpd.www/wp-blog-header.php(16): wp()
#10 /customers/1/0/1/okosongoro.com/httpd.www/index.php(17): require('/customers/1/0/...')
#11 {main}
  thrown in /customers/1/0/1/okosongoro.com/httpd.www/wp-includes/class-wp-hook.php on line 308