An Error occurred while handling another error: exception 'yii\web\HeadersAlreadySentException' with message 'Headers already sent in /home/npciqdegrees/public_html/pro/frontend/controllers/SiteController.php on line 3962.' in /home/npciqdegrees/public_html/pro/vendor/yiisoft/yii2/web/Response.php:366 Stack trace: #0 /home/npciqdegrees/public_html/pro/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders() #1 /home/npciqdegrees/public_html/pro/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send() #2 /home/npciqdegrees/public_html/pro/vendor/yiisoft/yii2/base/ErrorHandler.php(111): yii\web\ErrorHandler->renderException(Object(yii\web\HeadersAlreadySentException)) #3 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\web\HeadersAlreadySentException)) #4 {main} Previous exception: exception 'yii\web\HeadersAlreadySentException' with message 'Headers already sent in /home/npciqdegrees/public_html/pro/frontend/controllers/SiteController.php on line 3962.' in /home/npciqdegrees/public_html/pro/vendor/yiisoft/yii2/web/Response.php:366 Stack trace: #0 /home/npciqdegrees/public_html/pro/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders() #1 /home/npciqdegrees/public_html/pro/vendor/yiisoft/yii2/base/Application.php(392): yii\web\Response->send() #2 /home/npciqdegrees/public_html/pro/frontend/web/index.php(17): yii\base\Application->run() #3 {main}