[Plugin: Huge IT Slider] Undefined index

Hi! I’ve just installed the plugin in my web (https://www.japonia.es/) but it isn’t working on my static home page, so WordPress suggests me to uninstall due to the error, but it’s working fine in my another web (https://www.happycherry.es/)

Notice: Undefined index: slider_title_position in /var/www/vhost/japonia.es/home/html/wp-content/plugins/slider-image/slider_front_end.html.php on line 17

Notice: Undefined index: slider_description_position in /var/www/vhost/japonia.es/home/html/wp-content/plugins/slider-image/slider_front_end.html.php on line 19

Any idea? Thanks!