We are on 5.6 php

Below is the server error we are receiving
[Tue Jan 15 11:03:15.300294 2019] [lsapi:error] [pid 2527211:tid 47649404942080] [client 147.135.15.100:35728] [host social-impact.com] Backend fatal error: PHP Fatal error: Call to undefined method aviaShortcodeTemplate::__destruct() in /home/socialim/public_html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/audio-player.php on line 65\n, referer: https://social-impact.com/wp-cron.php?doing_wp_cron=1547578995.0600769519805908203125