Warning: The use statement with non-compound name 'Yii' has no effect in /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/config/params.php on line 3 
An Error occurred while handling another error:
yii\web\HeadersAlreadySentException: Headers already sent in /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/config/params.php on line 3. in /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send()
#2 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/base/ErrorHandler.php(123): 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 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/config/params.php on line 3. in /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/web/Response.php:366
Stack trace:
#0 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders()
#1 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/models/AccessBehavior.php(100): yii\web\Response->send()
#2 [internal function]: app\models\AccessBehavior->beforeAction(Object(yii\base\ActionEvent))
#3 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/base/Component.php(627): call_user_func(Array, Object(yii\base\ActionEvent))
#4 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/base/Module.php(700): yii\base\Component->trigger('beforeAction', Object(yii\base\ActionEvent))
#5 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/base/Controller.php(167): yii\base\Module->beforeAction(Object(yii\base\InlineAction))
#6 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/base/Module.php(528): yii\base\Controller->runAction('', Array)
#7 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction('', Array)
#8 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/vendor/yiisoft/yii2/base/Application.php(386): yii\web\Application->handleRequest(Object(yii\web\Request))
#9 /home/httpd/vhosts/cortecag.ch/demo.cortecag.ch/admin/index.php(12): yii\base\Application->run()
#10 {main}