Fatal error: Uncaught yii\base\InvalidArgumentException: Response content must not be an array. in /web/htdocs/www.rls-net.it/home/vendor/yiisoft/yii2/web/Response.php:1057 Stack trace: #0 /web/htdocs/www.rls-net.it/home/vendor/yiisoft/yii2/web/Response.php(337): yii\web\Response->prepare() #1 /web/htdocs/www.rls-net.it/home/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send() #2 /web/htdocs/www.rls-net.it/home/vendor/yiisoft/yii2/base/ErrorHandler.php(262): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException)) #3 [internal function]: yii\base\ErrorHandler->handleFatalError() #4 {main} thrown in /web/htdocs/www.rls-net.it/home/vendor/yiisoft/yii2/web/Response.php on line 1057