headers already sent

Yii 2.0 General Discussions
1

hi

i send a mail with

application.extensions.phpmailer.JPhpMailer

and i got this error but mail sent to destinator

Error 500

Cannot modify header information - headers already sent by (output started at /var/www/cames.org/agreg2015/framework/web/CController.php:794)

2

Ask on yii 1 forum.

3

I asume any echo in Controller. Please, publish code which is causing error