An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in /www/wwwroot/xuanzhi/var/www/testnew_site/controllers/BuildingController.php on line 23. in /www/wwwroot/xuanzhi/var/www/testnew_site/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /www/wwwroot/xuanzhi/var/www/testnew_site/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /www/wwwroot/xuanzhi/var/www/testnew_site/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send()
#2 /www/wwwroot/xuanzhi/var/www/testnew_site/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:
yii\web\HeadersAlreadySentException: Headers already sent in /www/wwwroot/xuanzhi/var/www/testnew_site/controllers/BuildingController.php on line 23. in /www/wwwroot/xuanzhi/var/www/testnew_site/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /www/wwwroot/xuanzhi/var/www/testnew_site/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /www/wwwroot/xuanzhi/var/www/testnew_site/vendor/yiisoft/yii2/base/Application.php(392): yii\web\Response->send()
#2 /www/wwwroot/xuanzhi/var/www/testnew_site/web/index.php(26): yii\base\Application->run()
#3 {main}