An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in /app/web/index.php on line 1. in /app/vendor/yiisoft/yii2/web/Response.php:369
Stack trace:
#0 /app/vendor/yiisoft/yii2/web/Response.php(342): yii\web\Response->sendHeaders()
#1 /app/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send()
#2 /app/vendor/yiisoft/yii2/base/ErrorHandler.php(152): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException))
#3 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\base\ErrorException))
#4 {main}
Previous exception:
yii\base\ErrorException: session_set_cookie_params(): Cannot change session cookie parameters when headers already sent in /app/vendor/yiisoft/yii2/web/Session.php:429
Stack trace:
#0 [internal function]: yii\base\ErrorHandler->handleError(2, 'session_set_coo...', '/app/vendor/yii...', 429, Array)
#1 /app/vendor/yiisoft/yii2/web/Session.php(429): session_set_cookie_params(Array)
#2 /app/vendor/yiisoft/yii2/web/Session.php(147): yii\web\Session->setCookieParamsInternal()
#3 /app/vendor/yiisoft/yii2/web/Session.php(711): yii\web\Session->open()
#4 /app/vendor/yiisoft/yii2/web/User.php(421): yii\web\Session->set('__returnUrl', 'http://admin.se...')
#5 /app/vendor/yiisoft/yii2/web/User.php(453): yii\web\User->setReturnUrl('http://admin.se...')
#6 /app/vendor/mdmsoft/yii2-admin/components/AccessControl.php(86): yii\web\User->loginRequired()
#7 /app/vendor/mdmsoft/yii2-admin/components/AccessControl.php(73): mdm\admin\components\AccessControl->denyAccess(Object(yii\web\User))
#8 /app/vendor/yiisoft/yii2/base/ActionFilter.php(77): mdm\admin\components\AccessControl->beforeAction(Object(yii\base\InlineAction))
#9 [internal function]: yii\base\ActionFilter->beforeFilter(Object(yii\base\ActionEvent))
#10 /app/vendor/yiisoft/yii2/base/Component.php(633): call_user_func(Array, Object(yii\base\ActionEvent))
#11 /app/vendor/yiisoft/yii2/base/Module.php(724): yii\base\Component->trigger('beforeAction', Object(yii\base\ActionEvent))
#12 /app/vendor/yiisoft/yii2/base/Controller.php(166): yii\base\Module->beforeAction(Object(yii\base\InlineAction))
#13 /app/vendor/yiisoft/yii2/base/Module.php(552): yii\base\Controller->runAction('', Array)
#14 /app/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction('', Array)
#15 /app/vendor/yiisoft/yii2/base/Application.php(384): yii\web\Application->handleRequest(Object(yii\web\Request))
#16 /app/web/main.php(12): yii\base\Application->run()
#17 /app/web/index.php(55): include('/app/web/main.p...')
#18 {main}