Fatal error: Uncaught Error: Call to undefined function PHPMailer\PHPMailer\mail() in /home/probwael/oiltrain.org/wp-includes/PHPMailer/PHPMailer.php:892
Stack trace:
#0 /home/probwael/oiltrain.org/wp-includes/PHPMailer/PHPMailer.php(2083): PHPMailer\PHPMailer\PHPMailer->mailPassthru('admin@oiltrain....', 'oiltrain.org Da...', '\r\n<html>\r\n<head...', 'Date: Sun, 1 Ma...', NULL)
#1 /home/probwael/oiltrain.org/wp-includes/PHPMailer/PHPMailer.php(1800): PHPMailer\PHPMailer\PHPMailer->mailSend('Date: Sun, 1 Ma...', '\r\n<html>\r\n<head...')
#2 /home/probwael/oiltrain.org/wp-includes/PHPMailer/PHPMailer.php(1615): PHPMailer\PHPMailer\PHPMailer->postSend()
#3 /home/probwael/oiltrain.org/wp-includes/pluggable.php(625): PHPMailer\PHPMailer\PHPMailer->send()
#4 /home/probwael/oiltrain.org/wp-content/plugins/security-malware-firewall/security-malware-firewall.php(1766): wp_mail(Array, 'oiltrain.org Da...', '\n<html>\n<head>\n...', Array)
#5 /home/probwael/oiltrain.org/wp-includes/class-wp-hook.php(341): spbc_send_daily_report('')
#6 /home/probwael/oiltrain.org/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array)
#7 /home/probwael/oiltrain.org/wp-includes/plugin.php(522): WP_Hook->do_action(Array)
#8 /home/probwael/oiltrain.org/wp-settings.php(593): do_action('plugins_loaded')
#9 /home/probwael/oiltrain.org/wp-config.php(149): require_once('/home/probwael/...')
#10 /home/probwael/oiltrain.org/wp-load.php(50): require_once('/home/probwael/...')
#11 /home/probwael/oiltrain.org/wp-blog-header.php(13): require_once('/home/probwael/...')
#12 /home/probwael/oiltrain.org/index.php(17): require('/home/probwael/...')
#13 {main}
thrown in /home/probwael/oiltrain.org/wp-includes/PHPMailer/PHPMailer.php on line 892