Error messages: Undefined index: evl_content_boxes_title_font in…

Please help!
We recently updated to the most current Evolve Theme so that we could take advantage of the mobile friendly version. Now there are error messages on top of our page: https://onnaturemagazine.com/, listed below. Could you please tell us how to get rid of these error messages, and if we should simply update our WordPress to the most current version to get rid of them – or if that would likely increase the problems here.

Notice: Undefined index: evl_content_boxes_title_font in /home4/ontarion/public_html/wp-content/themes/evolve/library/functions/basic-functions.php on line 1575

Notice: Undefined index: evl_content_boxes_title_font in /home4/ontarion/public_html/wp-content/themes/evolve/library/functions/basic-functions.php on line 1579

Notice: Undefined index: evl_content_boxes_title_font in /home4/ontarion/public_html/wp-content/themes/evolve/library/functions/basic-functions.php on line 1591

Notice: Undefined index: evl_content_boxes_description_font in /home4/ontarion/public_html/wp-content/themes/evolve/library/functions/basic-functions.php on line 1575

Notice: Undefined index: evl_content_boxes_description_font in /home4/ontarion/public_html/wp-content/themes/evolve/library/functions/basic-functions.php on line 1579

Notice: Undefined index: evl_content_boxes_description_font in /home4/ontarion/public_html/wp-content/themes/evolve/library/functions/basic-functions.php on line 1591

Thank you!