Warning: require_once(/usr/www/users/andretmmym/wp-includes/PHPMailer/PHPMailer.php): Failed to open stream: Permission denied in /usr/www/users/andretmmym/wp-content/plugins/wp-mail-smtp/src/Core.php on line 933

Fatal error: Uncaught Error: Failed opening required '/usr/www/users/andretmmym/wp-includes/PHPMailer/PHPMailer.php' (include_path='.:/usr/share/php') in /usr/www/users/andretmmym/wp-content/plugins/wp-mail-smtp/src/Core.php:933
Stack trace:
#0 /usr/www/users/andretmmym/wp-content/plugins/wp-mail-smtp/src/Core.php(676): WPMailSMTP\Core->generate_mail_catcher(true)
#1 /usr/www/users/andretmmym/wp-content/plugins/wp-mail-smtp/src/Core.php(661): WPMailSMTP\Core->replace_w_fake_phpmailer(NULL)
#2 /usr/www/users/andretmmym/wp-includes/class-wp-hook.php(324): WPMailSMTP\Core->replace_phpmailer('')
#3 /usr/www/users/andretmmym/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(Object(WPMailSMTP\Processor), Array)
#4 /usr/www/users/andretmmym/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#5 /usr/www/users/andretmmym/wp-settings.php(550): do_action('plugins_loaded')
#6 /usr/www/users/andretmmym/wp-config.php(48): require_once('/usr/www/users/...')
#7 /usr/www/users/andretmmym/wp-load.php(50): require_once('/usr/www/users/...')
#8 /usr/www/users/andretmmym/wp-blog-header.php(13): require_once('/usr/www/users/...')
#9 /usr/www/users/andretmmym/index.php(17): require('/usr/www/users/...')
#10 {main}
  thrown in /usr/www/users/andretmmym/wp-content/plugins/wp-mail-smtp/src/Core.php on line 933