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<b>Fatal error</b>:  Uncaught Error: Call to undefined function PHPMailer\PHPMailer\mail() in /home/muteswan/public_html/wp-includes/PHPMailer/PHPMailer.php:874
Stack trace:
#0 /home/muteswan/public_html/wp-includes/PHPMailer/PHPMailer.php(1945): PHPMailer\PHPMailer\PHPMailer-&gt;mailPassthru('admin@muteswanc...', '[muteswancapita...', '\r\n&lt;!DOCTYPE htm...', 'Date: Tue, 6 De...', NULL)
#1 /home/muteswan/public_html/wp-includes/PHPMailer/PHPMailer.php(1666): PHPMailer\PHPMailer\PHPMailer-&gt;mailSend('Date: Tue, 6 De...', '\r\n&lt;!DOCTYPE htm...')
#2 /home/muteswan/public_html/wp-includes/PHPMailer/PHPMailer.php(1502): PHPMailer\PHPMailer\PHPMailer-&gt;postSend()
#3 /home/muteswan/public_html/wp-includes/pluggable.php(542): PHPMailer\PHPMailer\PHPMailer-&gt;send()
#4 /home/muteswan/public_html/wp-content/plugins/better-wp-security/core/lib/class-itsec-mail.php(624): wp_mail(Array, '[muteswancapita...', '\n&lt;!DOCTYPE html...', Array, Array)
#5 /home/muteswan/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(532): ITSEC_Mail-&gt;send()
#6 /home/muteswan/public_html/wp-content/plugins/better-wp-security/core/notify.php(211): ITSEC_Notification_Center-&gt;send('digest', Object(ITSEC_Mail))
#7 /home/muteswan/public_html/wp-includes/class-wp-hook.php(308): ITSEC_Notify-&gt;send_daily_digest(false, 1663877821, Array)
#8 /home/muteswan/public_html/wp-includes/plugin.php(205): WP_Hook-&gt;apply_filters(false, Array)
#9 /home/muteswan/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(800): apply_filters('itsec_send_noti...', false, 1663877821, Array)
#10 /home/muteswan/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(750): ITSEC_Notification_Center-&gt;send_scheduled_notification('digest')
#11 /home/muteswan/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(721): ITSEC_Notification_Center-&gt;send_scheduled_notifications(Array)
#12 /home/muteswan/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(677): ITSEC_Notification_Center-&gt;check_notification_schedule_accurate(Array)
#13 /home/muteswan/public_html/wp-includes/class-wp-hook.php(308): ITSEC_Notification_Center-&gt;check_notification_schedule_fast('')
#14 /home/muteswan/public_html/wp-includes/class-wp-hook.php(332): WP_Hook-&gt;apply_filters(NULL, Array)
#15 /home/muteswan/public_html/wp-includes/plugin.php(517): WP_Hook-&gt;do_action(Array)
#16 /home/muteswan/public_html/wp-settings.php(617): do_action('init')
#17 /home/muteswan/public_html/wp-config.php(102): require_once('/home/muteswan/...')
#18 /home/muteswan/public_html/wp-load.php(50): require_once('/home/muteswan/...')
#19 /home/muteswan/public_html/wp-blog-header.php(13): require_once('/home/muteswan/...')
#20 /home/muteswan/public_html/index.php(17): require('/home/muteswan/...')
#21 {main}
  thrown in <b>/home/muteswan/public_html/wp-includes/PHPMailer/PHPMailer.php</b> on line <b>874</b><br />