Fatal error: Uncaught Error: Call to undefined function Automattic\Jetpack\Assets\wp_is_serving_rest_request() in /home/pcproject/ftp/pm15/wp-content/plugins/quadmenu/jetpack_vendor/automattic/jetpack-assets/src/class-script-data.php:113 Stack trace: #0 /home/pcproject/ftp/pm15/wp-content/plugins/quadmenu/jetpack_vendor/automattic/jetpack-assets/src/class-script-data.php(88): Automattic\Jetpack\Assets\Script_Data::is_authenticated_rest_request() #1 /home/pcproject/ftp/pm15/wp-includes/class-wp-hook.php(308): Automattic\Jetpack\Assets\Script_Data::render_script_data('') #2 /home/pcproject/ftp/pm15/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array) #3 /home/pcproject/ftp/pm15/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #4 /home/pcproject/ftp/pm15/wp-includes/script-loader.php(2132): do_action('wp_print_script...') #5 /home/pcproject/ftp/pm15/wp-includes/class-wp-hook.php(308): wp_print_head_scripts('') #6 /home/pcproject/ftp/pm15/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #7 /home/pcproject/ftp/pm15/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #8 /home/pcproject/ftp/pm15/wp-includes/theme-compat/header-embed.php(29): do_action('embed_head') #9 /home/pcproject/ftp/pm15/wp-includes/template.php(783): require_once('/home/pcproject...') #10 /home/pcproject/ftp/pm15/wp-includes/template.php(718): load_template('/home/pcproject...', true, Array) #11 /home/pcproject/ftp/pm15/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #12 /home/pcproject/ftp/pm15/wp-includes/theme-compat/embed.php(13): get_header('embed') #13 /home/pcproject/ftp/pm15/wp-includes/template-loader.php(106): include('/home/pcproject...') #14 /home/pcproject/ftp/pm15/wp-blog-header.php(19): require_once('/home/pcproject...') #15 /home/pcproject/ftp/pm15/index.php(17): require('/home/pcproject...') #16 {main} thrown in /home/pcproject/ftp/pm15/wp-content/plugins/quadmenu/jetpack_vendor/automattic/jetpack-assets/src/class-script-data.php on line 113