I added new language file to my site (all language files are the same) and then i got this error.
Warning: Cannot modify header information - headers already sent by (output started at /home/teirleta/public_html/protected/modules/referral/messages/lv/uniprogy.php:1) in /home/teirleta/public_html/protected/modules/base/worklets/WBaseInit.php on line 116
Which is:
WBaseInit.php on line 116
114 // setting all default headers
115 foreach($this->headers() as $h)
116 header($h);