Warning – Headers already sent

When cron it’s executed this warning appear on logs:

E_WARNING: session_start(): Cannot start session when headers already sent
in session_start called at /var/www/blog_ftm/wp-content/plugins/deeper-comments/models/module/depc-model-module-google.php (26)
in Depc_Model_Module_Google::__construct called at /var/www/blog_ftm/wp-content/plugins/deeper-comments/models/depc-model.php (28)
in Depc_Model::get_instance called at /var/www/blog_ftm/wp-content/plugins/deeper-comments/controllers/module/depc-controller-module-google.php (20)
in Depc_Controller_Module_Google::__construct called at /var/www/blog_ftm/wp-content/plugins/deeper-comments/controllers/depc-controller.php (25)
in Depc_Controller::get_instance called at /var/www/blog_ftm/wp-content/plugins/deeper-comments/lib/depc-core.php (88)
in Depc_Core::__construct called at /var/www/blog_ftm/wp-content/plugins/deeper-comments/lib/depc-core.php (65)
in Depc_Core::get_instance called at /var/www/blog_ftm/wp-content/plugins/deeper-comments/deeper-comments.php (56)
in Depc::__construct called at /var/www/blog_ftm/wp-content/plugins/deeper-comments/deeper-comments.php (102)
in include_once called at /var/www/blog_ftm/wp/wp-settings.php (362)
in require_once called at /var/www/blog_ftm/wp-config.php (112)
in require_once called at /var/www/blog_ftm/wp/wp-load.php (42)
in require_once called at /var/www/blog_ftm/wp/wp-cron.php (39)