Fatal error: Uncaught Error: Call to undefined function PHPMailer\PHPMailer\mail() in /var/www/web1701/html/wp-includes/PHPMailer/PHPMailer.php:874 Stack trace: #0 /var/www/web1701/html/wp-includes/PHPMailer/PHPMailer.php(1930): PHPMailer\PHPMailer\PHPMailer->mailPassthru('stephane.hugel@...', '=?UTF-8?Q?[roll...', '\r\n<!DOCTYPE htm...', 'Date: Wed, 10 A...', NULL) #1 /var/www/web1701/html/wp-includes/PHPMailer/PHPMailer.php(1658): PHPMailer\PHPMailer\PHPMailer->mailSend('Date: Wed, 10 A...', '\r\n<!DOCTYPE htm...') #2 /var/www/web1701/html/wp-includes/PHPMailer/PHPMailer.php(1494): PHPMailer\PHPMailer\PHPMailer->postSend() #3 /var/www/web1701/html/wp-includes/pluggable.php(548): PHPMailer\PHPMailer\PHPMailer->send() #4 /var/www/web1701/html/wp-content/plugins/better-wp-security/core/lib/class-itsec-mail.php(721): wp_mail(Array, '[rollhaeuser.de...', '\n<!DOCTYPE html...', Array, Array) #5 /var/www/web1701/html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(532): ITSEC_Mail->send() #6 /var/www/web1701/html/wp-content/plugins/better-wp-security/core/notify.php(211): ITSEC_Notification_Center->send('digest', Object(ITSEC_Mail)) #7 /var/www/web1701/html/wp-includes/class-wp-hook.php(307): ITSEC_Notify->send_daily_digest(false, 1657701407, Array) #8 /var/www/web1701/html/wp-includes/plugin.php(191): WP_Hook->apply_filters(false, Array) #9 /var/www/web1701/html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(800): apply_filters('itsec_send_noti...', false, 1657701407, Array) #10 /var/www/web1701/html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(750): ITSEC_Notification_Center->send_scheduled_notification('digest') #11 /var/www/web1701/html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(721): ITSEC_Notification_Center->send_scheduled_notifications(Array) #12 /var/www/web1701/html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(677): ITSEC_Notification_Center->check_notification_schedule_accurate(Array) #13 /var/www/web1701/html/wp-includes/class-wp-hook.php(307): ITSEC_Notification_Center->check_notification_schedule_fast('') #14 /var/www/web1701/html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #15 /var/www/web1701/html/wp-includes/plugin.php(476): WP_Hook->do_action(Array) #16 /var/www/web1701/html/wp-settings.php(598): do_action('init') #17 /var/www/web1701/html/wp-config.php(94): require_once('/var/www/web170...') #18 /var/www/web1701/html/wp-load.php(50): require_once('/var/www/web170...') #19 /var/www/web1701/html/wp-blog-header.php(13): require_once('/var/www/web170...') #20 /var/www/web1701/html/index.php(17): require('/var/www/web170...') #21 {main} thrown in /var/www/web1701/html/wp-includes/PHPMailer/PHPMailer.php on line 874