error with mobile

Hello
I have installed bannerize on http://www.motoinlombardia.it and il works fine from desktop.
but i have tried from smartphone and it give me this error

Fatal error: Call to a member function bannerize() on a non-object in /home/motoinlo/public_html/wp-content/plugins/wp-bannerize/Classes/wpBannerizeWidget.php on line 64

Have you an idea of the problem?

thank’s
francesco

https://ww.wp.xz.cn/plugins/wp-bannerize/