500 error when email is sent from the page

  • I try to utilize the plugin v 2.0.23

    When a user clicks on ‘Ok’ button on the Woocommerce /check-out/ page the 500 appears in the console

    The latest errors in error_log:

    ERROR PostmanSendTestEmailAjaxController: Test Email NOT delivered to server – 2

    PHP Fatal error: Cannot declare class PHPMailer\PHPMailer\Exception, because the name is already in use in …./themes/…./PHPMailer/src/Exception.php on line 28

    The page I need help with: [log in to see the link]

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