Fatal error: cannot redeclare phpmailerexception

Hi all,

I am receiving this message: “Fatal error: Cannot redeclare class phpmailerException in /var/www/sites/theworrychest.com/www/protected/extensions/mailer/phpmailer/class.phpmailer.php on line 2067”

when someone submits a message through my contact form. I am using the plugin ‘contact form 7’.

I understand that this implies that the class is being called more than once and I have looked at other forums where they suggested to use “require_once”… However, I cannot find where to add this code.