After installing Responsive Add Ons I can not manage or see my website, there is a problem I have to face. So please solve my problems, I am in a tension. When I try to open my website it show..
Fatal error: Call to undefined function wp_get_theme() in /home/u301312290/public_html/wp-content/plugins/responsive-add-ons/responsive-add-ons.php on line 121
My website name is