An Error occurred while handling another error: yii\web\HeadersAlreadySentException: Headers already sent in /home/y/yuriyiru/retouchers.online/controllers/SiteController.php on line 451. in /home/y/yuriyiru/retouchers.online/vendor/yiisoft/yii2/web/Response.php:369 Stack trace: #0 /home/y/yuriyiru/retouchers.online/vendor/yiisoft/yii2/web/Response.php(342): yii\web\Response->sendHeaders() #1 /home/y/yuriyiru/retouchers.online/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send() #2 /home/y/yuriyiru/retouchers.online/vendor/yiisoft/yii2/base/ErrorHandler.php(152): yii\web\ErrorHandler->renderException(Object(yii\web\HeadersAlreadySentException)) #3 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\web\HeadersAlreadySentException)) #4 {main} Previous exception: yii\web\HeadersAlreadySentException: Headers already sent in /home/y/yuriyiru/retouchers.online/controllers/SiteController.php on line 451. in /home/y/yuriyiru/retouchers.online/vendor/yiisoft/yii2/web/Response.php:369 Stack trace: #0 /home/y/yuriyiru/retouchers.online/vendor/yiisoft/yii2/web/Response.php(342): yii\web\Response->sendHeaders() #1 /home/y/yuriyiru/retouchers.online/vendor/yiisoft/yii2/base/Application.php(390): yii\web\Response->send() #2 /home/y/yuriyiru/retouchers.online/web/index.php(12): yii\base\Application->run() #3 {main}