An Error occurred while handling another error: yii\web\HeadersAlreadySentException: Headers already sent in /mnt/www/cms/cms/controllers/AnnouncesController.php on line 100. in /mnt/www/cms/vendor/yiisoft/yii2/web/Response.php:366 Stack trace: #0 /mnt/www/cms/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders() #1 /mnt/www/cms/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send() #2 /mnt/www/cms/vendor/yiisoft/yii2/base/ErrorHandler.php(123): yii\web\ErrorHandler->renderException() #3 [internal function]: yii\base\ErrorHandler->handleException() #4 {main} Previous exception: yii\web\HeadersAlreadySentException: Headers already sent in /mnt/www/cms/cms/controllers/AnnouncesController.php on line 100. in /mnt/www/cms/vendor/yiisoft/yii2/web/Response.php:366 Stack trace: #0 /mnt/www/cms/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders() #1 /mnt/www/cms/vendor/yiisoft/yii2/base/Application.php(392): yii\web\Response->send() #2 /mnt/www/cms/cms/web/index.php(25): yii\base\Application->run() #3 {main}