Fatal error: Uncaught yii\web\HeadersAlreadySentException: Headers already sent in /var/www/html/snpmb/vendor/yiisoft/yii2/web/Response.php on line 428. in /var/www/html/snpmb/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /var/www/html/snpmb/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /var/www/html/snpmb/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send()
#2 /var/www/html/snpmb/vendor/yiisoft/yii2/base/ErrorHandler.php(262): yii\web\ErrorHandler->renderException()
#3 [internal function]: yii\base\ErrorHandler->handleFatalError()
#4 {main}
thrown in /var/www/html/snpmb/vendor/yiisoft/yii2/web/Response.php on line 366