BuddyPress.org

Newly, this error has tormented me how to fix it.
Thanks to all friends’ attention and answers
I really want to know what the problem with the theme is.
Explain that WordPress is a multi-site network.
The theme was okay before.
php 7.3

Fatal error: Uncaught Error: Call to undefined function bp_notifications_get_notifications_for_user() in /home/banoyeir/domains/mysite.com/public_html/wp-content/themes/jannah_v3.2.0/jannah/framework/plugins/class-tielabs-buddypress.php:120 Stack trace: #0 /home/banoyeir/domains/banoyeirani.com/public_html/wp-includes/class-wp-hook.php(286): TIELABS_BUDDYPRESS->get_notifications(”) #1 /home/banoyeir/domains/mysite.com/public_html/wp-includes/plugin.php(208): WP_Hook->apply_filters(”, Array) #2 /home/banoyeir/domains/banoyeirani.com/public_html/wp-content/themes/jannah_v3.2.0/jannah/templates/header/components.php(121): apply_filters(‘TieLabs/BuddyPr…’, ”) #3 /home/banoyeir/domains/mysite.com/public_html/wp-content/themes/jannah_v3.2.0/jannah/framework/classes/class-tielabs-helper.php(81): include(‘/home/banoyeir/…’) #4 /home/banoyeir/domains/mysite.com/public_html/wp-content/themes/jannah_v3.2.0/jannah/templates/header/nav-top.php(113): TIELABS_HELPER::get_template_part(‘templates/heade…’, ”, in /home/banoyeir/domains/mysite.com/public_html/wp-content/themes/jannah_v3.2.0/jannah/framework/plugins/class-tielabs-buddypress.php on line 120