Feature List Section Errors

We installed your plugin as we wanted to purchase but when adding links in the organic feature list section, the following error appears:/

“warning: use of undefined constant organic_widgets_pro_18n
feature-list-section-widget.php”

We googled the error and see it on other pages using your plugin. See the following/
https://schmaltzycraftsy.com/
https://www.paulinecallais.com/about/