I have been using the XStore theme for years and recently it shows error “There has been a critical error on this website. Please check your site admin email inbox for instructions.”. Then I turned-off all plugins and it backs to normal, but when I activate the plugin “8theme Core” from “XStore Core ”, the error shows again! Please login to my WP admin and activate the plugin, you will see the error. The login details are in the private content area. Thank you.