E_ERROR and Uncaught Error with Enfold

Hello Kriesi Team,
this is what i get:

Wenn du Hilfe bei diesem Problem suchst, wirst du möglicherweise nach einigen der folgenden Informationen gefragt:
#WordPress-Version 5.3
Aktuelles Theme: Enfold (Version 4.6.3.1)
Aktuelles Plugin: (Version )
PHP-Version 7.2.24###

#

Fehler-Details
==============
Ein Fehler vom Typ E_ERROR wurde in der Zeile 167 der Datei /home/.sites/345/site7234611/web/wp-content/themes/enfold/includes/helper-social-media.php verursacht. Fehlermeldung: Uncaught Error: Call to undefined function av_icon_string() in /home/.sites/345/site7234611/web/wp-content/themes/enfold/includes/helper-social-media.php:167
Stack trace:
#0 /home/.sites/345/site7234611/web/wp-content/themes/enfold/includes/helper-social-media.php(195): avia_social_media_icons->build_icon(Array)
#1 /home/.sites/345/site7234611/web/wp-content/themes/enfold/includes/helper-social-media.php(23): avia_social_media_icons->html()
#2 /home/.sites/345/site7234611/web/wp-content/themes/enfold/functions-enfold.php(1399): avia_social_media_icons(Array, false)
#3 /home/.sites/345/site7234611/web/wp-includes/class-wp-hook.php(288): avia_sidebar_menu_additions(”)
#4 /home/.sites/345/site7234611/web/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(”, Array)
#5 /home/.sites/345/site7234611/web/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#6 /home/.sites/345/site7234611/web/wp-content/themes/enfold/includes/helper-main-menu.php(211): do_action(‘ava_after_main_…’)
#7 /home/.sites/345/si####