I am new to Magento and was trying tutorial's example, and my site got broken with HTTP ERROR 500 when i have added my events.xml under my module's etc folder

<event name="controller_action_predispatch">
    <observer name="predispatch" instance="MyCompany\Test\Observer\ControlerPreDispatch" shared="false" />

along with my observer and here is the constructor

public function __construct(\Magento\Framework\App\Response\RedirectInterface $redirect,\Magento\Framework\App\ActionFlag $actionFlag)

Here is apache error:

PHP Fatal error:  `Uncaught TypeError: Argument 1 passed to MyCompany\\Test\\Observer\\ControlerPreDispatch::__construct() must implement interface Magento\\Framework\\App\\Response\\RedirectInterface,` .....

any clue?

  • 1
    Can you post your full code lines of your Observer? – Khoa TruongDinh Feb 20 '17 at 10:58
  • did you clear var/generation? – Jaimin Sutariya Feb 20 '17 at 12:55
  • namespace MyCompany\Test\Observer; use Magento\Framework\Event\ObserverInterface; class ControlerPreDispatch implements ObserverInterface { protected $redirect; protected $_actionFlag; public function __construct(\Magento\Framework\App\Response\RedirectInterface $redirect,\Magento\Framework\App\ActionFlag $actionFlag) { $this->_actionFlag = $actionFlag; } – Bashir Feb 21 '17 at 18:30
  • public function execute(\Magento\Framework\Event\Observer $observer) { $request = $observer->getEvent()->getData('request'); if ($request->getModuleName() != 'catalog' || $request->getControllerName() !='product') { $controller = $observer->getControllerAction(); $this->_actionFlag->set('',\Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true); $this->redirect->redirect($controller->getResponse(),'catalog/product/view/id/1'); } } – Bashir Feb 21 '17 at 18:30
  • No i didn't delete var/generation ... why should i ? – Bashir Feb 21 '17 at 18:32

All needed was just to delete the var/generation and recompile di again "php magento setup:di:compile"


After editing __construct function of any class you need to remove /var/generation directory.

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