I'm working on a Magento module for the past month, and everything works great on my local machine. Then I decided to release the module as a beta and test it online in a newly installed store, and after installing it from CLI, I'm getting this error:

Werules\Chatbot\Block\Webhook\Messenger Missed required argument request in parent::__construct call. File: /htdocs/magento2/app/code/Werules/Chatbot/Block/Webhook/Messenger.php

Why is that happening? Here is the file app/code/Werules/Chatbot/Block/Webhook/Messenger.php

namespace Werules\Chatbot\Block\Webhook;

class Messenger extends \Werules\Chatbot\Block\Webhook\Index
    protected function processRequest()
        // SOME CODE HERE

and app/code/Werules/Chatbot/Block/Webhook/Index.php

namespace Werules\Chatbot\Block\Webhook;

class Index extends \Magento\Framework\View\Element\Template
    protected $_helper;
    protected $_chatbotAPI;
    protected $_messageModel;
    protected $_objectManager;
    protected $_define;
    protected $_request;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\ObjectManagerInterface $objectManager,
        \Werules\Chatbot\Helper\Data $helperData,
        \Werules\Chatbot\Model\ChatbotAPI $chatbotAPI,
        \Magento\Framework\App\Request\Http $request,
        \Werules\Chatbot\Model\MessageFactory $message
        $this->_helper = $helperData;
        $this->_chatbotAPI = $chatbotAPI;
        $this->_request = $request;
        $this->_messageModel = $message;
        $this->_objectManager = $objectManager;
        $this->_define = new \Werules\Chatbot\Helper\Define;

What I am doing wrong? Thank you.

EDIT: I'm extending another block from my module, is that a bad thing? Maybe this is the problem?

  • Did you delete var/generation first?
    – PY Yick
    Dec 1, 2017 at 2:51

1 Answer 1


The error is self-explained. You forgot to inject the arguments from the parent. $context and $data are mandatory.


public function __construct(
    \Magento\Framework\View\Element\Template\Context $context, // parent argument
    array $data = [] // parent argument
) {
    parent::__construct($context, $data);

I'm extending another block from my module, is that a bad thing? Maybe this is the problem?

It's normal.

  • Thank you. So I'm missing the data array in the Index block? Because my Messenger block doesn't have a constructor
    – Pablo
    Dec 1, 2017 at 9:56
  • As I see, you're missing in Index.php Dec 1, 2017 at 10:17
  • Is this data array required by Magento? Because I'm not using it in my code. For me it seems that what is missing is "the required argument request in parent::__construct", as I have a \Magento\Framework\App\Request\Http $request as parameter for my Index block.
    – Pablo
    Dec 1, 2017 at 12:10
  • array $data = [] is required by the parent \Magento\Framework\View\Element\Template. Did you try my suggestion? Dec 2, 2017 at 9:03
  • 1
    @Pablo updated my answer. You can update my answer also. Dec 2, 2017 at 21:28

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