An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in  on line 0. in /app/vendor/yiisoft/yii2/web/Response.php:368
Stack trace:
#0 /app/vendor/yiisoft/yii2/web/Response.php(341): yii\web\Response->sendHeaders()
#1 /app/vendor/yiisoft/yii2/web/ErrorHandler.php(138): yii\web\Response->send()
#2 /app/vendor/craftcms/cms/src/web/ErrorHandler.php(192): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException))
#3 /app/vendor/yiisoft/yii2/base/ErrorHandler.php(151): craft\web\ErrorHandler->renderException(Object(yii\base\ErrorException))
#4 /app/vendor/craftcms/cms/src/web/ErrorHandler.php(66): yii\base\ErrorHandler->handleException(Object(yii\base\ErrorException))
#5 [internal function]: craft\web\ErrorHandler->handleException(Object(yii\base\ErrorException))
#6 {main}
Previous exception:
yii\base\ErrorException: PHP Request Startup: Input variables exceeded 0. To increase the limit change max_input_vars in php.ini. in /app/vendor/yiisoft/yii2/base/ErrorException.php:39
Stack trace:
#0 /app/vendor/craftcms/cms/bootstrap/web.php(40): require()
#1 /app/web/index.php(11): require('/app/vendor/cra...')
#2 {main}