Download Duplicate Sweeper

Fatal error: Uncaught PHPMailer\PHPMailer\Exception: Invalid address: (to): in /home/wideangle/phplibs/PHPMailer-6.6.0/src/PHPMailer.php:1092 Stack trace: #0 /home/wideangle/phplibs/PHPMailer-6.6.0/src/PHPMailer.php(1014): PHPMailer\PHPMailer\PHPMailer->addOrEnqueueAnAddress('to', '', '') #1 /home/wideangle/public_html/duplicatesweeper/email-download-link.php(66): PHPMailer\PHPMailer\PHPMailer->addAddress(NULL) #2 {main} thrown in /home/wideangle/phplibs/PHPMailer-6.6.0/src/PHPMailer.php on line 1092