Fatal error: Uncaught Error: Call to undefined function wp_is_json_request() in /home1/mailback/public_html/wp-content/plugins/revslider/includes/slider.class.php:392 Stack trace: #0 /home1/mailback/public_html/wp-content/plugins/revslider/includes/slider.class.php(368): RevSliderSlider->init_by_data(Array) #1 /home1/mailback/public_html/wp-content/plugins/revslider/public/revslider-front-global.class.php(265): RevSliderSlider->init_by_alias('homepage') #2 /home1/mailback/public_html/wp-includes/class-wp-hook.php(298): RevSliderFrontGlobal::get_images_for_seo(Array, 'post', Object(stdClass)) #3 /home1/mailback/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters(Array, Array) #4 /home1/mailback/public_html/wp-content/plugins/wordpress-seo/inc/sitemaps/class-post-type-sitemap-provider.php(259): apply_filters('wpseo_sitemap_e...', Array, 'post', Object(stdClass)) #5 /home1/mailback/public_html/wp-content/plugins/wordpress-seo/inc/sitemaps/class-sitemaps.php(302): WPSEO_Post_Type_Sitemap_Provider->get_sitemap_link in /home1/mailback/public_html/wp-content/plugins/revslider/includes/slider.class.php on line 392