Fatal error: Uncaught Error: Class 'WPMailSMTP\Providers\MailerAbstract' not found in /var/www/sweves.se/httpdocs/wp-content/plugins/wp-mail-smtp/src/Providers/SparkPost/Mailer.php:16 Stack trace: #0 {main} thrown in /var/www/sweves.se/httpdocs/wp-content/plugins/wp-mail-smtp/src/Providers/SparkPost/Mailer.php on line 16