BuddyPress.org

Some of my users encounter this statement “”There has been a critical error on your site.”, when they create groups. Although when they refresh it and click on their profile the group is created. This is the error found.
[11-Sep-2020 07:12:01 UTC] PHP Fatal error: Uncaught Error: Class ‘PHPMailer’ not found in /srv/htdocs/wp-content/plugins/buddypress/bp-core/classes/class-bp-phpmailer.php:91
Stack trace:
#0 /srv/htdocs/wp-content/plugins/buddypress/bp-core/bp-core-functions.php(3233): BP_PHPMailer->bp_email(Object(BP_Email))
#1 /srv/htdocs/wp-content/plugins/buddypress/bp-groups/bp-groups-notifications.php(365): bp_send_email(‘groups-invitati…’, 102044344, Array)
#2 /srv/htdocs/wp-content/plugins/buddypress/bp-groups/classes/class-bp-groups-invitation-manager.php(55): groups_notification_group_invites(Object(BP_Groups_Group), 102044344, 102044348)
#3 /srv/htdocs/wp-content/plugins/buddypress/bp-core/classes/class-bp-invitation-manager.php(197): BP_Groups_Invitation_Manager->run_send_action(Object(BP_Invitation))
#4 /srv/htdocs/wp-content/plugins/buddypress/bp-groups/bp-groups-functions.php(1718): BP_Invitation_Manager->send_invitation_by_id(1178)
#5 /srv/htdocs/wp-content/plugins/buddypress/bp-groups/actions/create.php(139): groups_send_invites(Array)
#6 /wordpress/core/5.5.1/wp-includes/class-wp-hook.php(287): groups_action_create_group(”)
#7 /wordpress/core/5.5.1/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#8 /wordpress/core/5.5.1/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#9 /srv/htdocs/wp-content/plugins/buddypress/bp-core/bp-core-dependency.php(353): do_action(‘bp_actions’)
#10 /wordpress/core/5.5.1/wp-includes/class-wp-hook.php(287): bp_actions(”)
#11 /wordpress/core/5.5.1/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#12 /wordpress/core/5.5.1/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#13 /srv/htdocs/wp-content/plugins/buddypress/bp-core/bp-core-dependency.php(430): do_action(‘bp_template_red…’)
#14 /wordpress/core/5.5.1/wp-includes/class-wp-hook.php(287): bp_template_redirect(”)
#15 /wordpress/core/5.5.1/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#16 /wordpress/core/5.5.1/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#17 /wordpress/core/5.5.1/wp-includes/template-loader.php(13): do_action(‘template_redire…’)
#18 /wordpress/core/5.5.1/wp-blog-header.php(19): require_once(‘/wordpress/core…’)
#19 /wordpress/core/5.5.1/index.php(17): require(‘/wordpress/core…’)
#20 {main}
thrown in /srv/htdocs/wp-content/plugins/buddypress/bp-core/classes/class-bp-phpmailer.php on line 91

I hope someone can help me with this. This is a link to my site https://getaprofessor.com/