I have a known error (advices to start a new thread)
PHP Fatal error: Cannot declare class PHPMailer\\PHPMailer\\SMTP, because the name is already in use in /www/wp-includes/PHPMailer/SMTP.php on line 30, referer: https://www….com/wp-admin/plugin-install.php?tab=popular
I have tried competitor plugin, all the same results. The moment I activate the plugin the site crashes with this critical error.
I have deactivated all other plugins, same result.
Is there a fix for the plugin or to disable the core phpmailer?
best Arjan