It doesn′t work

What’s your site url ?

Hello!

https://www.facebookparalasempresas.com/

Finally it worked, but when I activate the plugin, the lateral widgets don`t display on the web.

So, I can′t use your plugin…… ??

https://www.jeriffcheng.com/wordpress-plugins/easy-smooth-scroll-links#faqs

check if you’re using JS minify plugins like “WP Minify“, you should exclude
inline scripts

and

//cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.3/jquery.easing.min.js

from combining or minification.