Social Media Helper Error

Hi,

I get a message telling me that there is an error on my site when WordPress was updated. This is the information I get:

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.4.2
Current theme: Enfold Child (version 1.0)
Current plugin: (version )
PHP version 7.2.31

Error Details
=============
An error of type E_ERROR was caused in line 167 of the file /home/saysyour/public_html/wp-content/themes/enfold/includes/helper-social-media.php. Error message: Uncaught Error: Call to undefined function av_icon_string() in /home/saysyour/public_html/wp-content/themes/enfold/includes/helper-social-media.php:167
Stack trace:
#0 /home/saysyour/public_html/wp-content/themes/enfold/includes/helper-social-media.php(195): avia_social_media_icons->build_icon(Array)
#1 /home/saysyour/public_html/wp-content/themes/enfold/includes/helper-social-media.php(23): avia_social_media_icons->html()
#2 /home/saysyour/public_html/wp-content/themes/enfold/includes/helper-main-menu.php(10): avia_social_media_icons(Array, false)
#3 /home/saysyour/public_html/wp-includes/template.php(725): require(‘/home/saysyour/…’)
#4 /home/saysyour/public_html/wp-includes/template.php(672): load_template(‘/home/saysyour/…’, false)
#5 /home/saysyour/public_html/wp-includes/general-template.php(168): locate_template(Array, true, false)
#6 /home/saysyour/public_html/wp-content/themes/enfold/header.php(120): get_template_part(‘includes/helper’, ‘main-menu’)
#7 /home/saysyour/public_html/wp-includes/templ

Can you tell me how to fix this problem? My website is https://saysyou.net.
Thank you.
Michele