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An Error occurred while handling another error:
exception 'yii\web\HeadersAlreadySentException' with message 'Headers already sent in /var/www/html/hms/backend/web/index.php on line 7.' in /var/www/html/hms/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /var/www/html/hms/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /var/www/html/hms/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send()
#2 /var/www/html/hms/vendor/yiisoft/yii2/base/ErrorHandler.php(111): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException))
#3 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\base\ErrorException))
#4 {main}
Previous exception:
exception 'yii\base\ErrorException' with message 'session_start(): Cannot send session cookie - headers already sent by (output started at /var/www/html/hms/backend/web/index.php:7)' in /var/www/html/hms/vendor/yiisoft/yii2/web/Session.php:137
Stack trace:
#0 [internal function]: yii\base\ErrorHandler->handleError(2, 'session_start()...', '/var/www/html/h...', 137, Array)
#1 /var/www/html/hms/vendor/yiisoft/yii2/web/Session.php(137): session_start()
#2 /var/www/html/hms/vendor/yiisoft/yii2/web/Session.php(624): yii\web\Session->open()
#3 /var/www/html/hms/vendor/yiisoft/yii2/web/User.php(414): yii\web\Session->set('__returnUrl', '/')
#4 /var/www/html/hms/vendor/yiisoft/yii2/web/User.php(446): yii\web\User->setReturnUrl('/')
#5 /var/www/html/hms/vendor/yiisoft/yii2/filters/AccessControl.php(156): yii\web\User->loginRequired()
#6 /var/www/html/hms/vendor/yiisoft/yii2/filters/AccessControl.php(140): yii\filters\AccessControl->denyAccess(Object(yii\web\User))
#7 /var/www/html/hms/vendor/yiisoft/yii2/base/ActionFilter.php(77): yii\filters\AccessControl->beforeAction(Object(yii\base\InlineAction))
#8 [internal function]: yii\base\ActionFilter->beforeFilter(Object(yii\base\ActionEvent))
#9 /var/www/html/hms/vendor/yiisoft/yii2/base/Component.php(627): call_user_func(Array, Object(yii\base\ActionEvent))
#10 /var/www/html/hms/vendor/yiisoft/yii2/base/Controller.php(274): yii\base\Component->trigger('beforeAction', Object(yii\base\ActionEvent))
#11 /var/www/html/hms/vendor/yiisoft/yii2/web/Controller.php(164): yii\base\Controller->beforeAction(Object(yii\base\InlineAction))
#12 /var/www/html/hms/vendor/yiisoft/yii2/base/Controller.php(155): yii\web\Controller->beforeAction(Object(yii\base\InlineAction))
#13 /var/www/html/hms/vendor/yiisoft/yii2/base/Module.php(528): yii\base\Controller->runAction('', Array)
#14 /var/www/html/hms/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction('', Array)
#15 /var/www/html/hms/vendor/yiisoft/yii2/base/Application.php(386): yii\web\Application->handleRequest(Object(yii\web\Request))
#16 /var/www/html/hms/backend/web/index.php(23): yii\base\Application->run()
#17 {main}