I'm a new Magento 2 developer that's trying to create a widget with a picture in it and I've been following some tutorials to get started. I'm having some trouble though with dependency injection in the Block-class.

Here is the error:

Error filtering template: Recoverable Error: Argument 1 passed to Magento\Framework\View\Element\Template::__construct() must be an instance of Magento\Framework\View\Element\Template\Context, instance of Magento\Framework\ObjectManager\ObjectManager given, called in C:\xampp\htdocs\magento\vendor\magento\framework\ObjectManager\Factory\AbstractFactory.php on line 93 and defined in C:\xampp\htdocs\magento\vendor\magento\framework\View\Element\Template.php on line 128

The error obviously states that the constructor of the parent if acquiring the wrong information, but as far as I can tell I'm feeding it the correct data.

Here is my class:

namespace X\Y\Block\Widget;

class CustomWidget extends \Magento\Framework\View\Element\Template
implements \Magento\Widget\Block\BlockInterface
    public function _toHtml()

I've heard across the web though that using the _toHtml() function is bad practice and I should use the constructor instead, but that gives me the same effect. So far I've used these constructors:

protected function _construct()

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

I have also tried just setting

protected $_template = "widget/custom_widget.phtml";

but that generates the same result.

Have anyone seen this before? I have reinstalled Magento several times and my co-workers do not have this problem, so there's definitely something weird going on here.

Any help is much appreciated!

  • The one underscore in the public function _construct method name is typo or you have it in the code? Commented Mar 31, 2017 at 16:15
  • Well, right now it is in my code yes, but I've also tried __construct with two underscores and I've seen different sites say different things. Which is correct? Commented Apr 7, 2017 at 11:32
  • You should use two underscores in real construct method. The one-underscore construct are called at the end of real construct method in the abstract block & model classes (\Magento\Framework\Model\AbstractModel::__construct() , \Magento\Framework\View\Element\AbstractBlock::__construct() and maybe somewhere else), but it has no arguments (not compatible with dependency injection). Commented Apr 7, 2017 at 11:38
  • Oh wow, I had no idea. Thanks a bunch! I've been working on different things this week but I'll check all the answers here now and see if it solves my problem. Commented Apr 7, 2017 at 11:50

2 Answers 2


Check all of your namespaces, class names, file & folder names. This error can occurs when your namespace is like:


and your path to that file is like:


The second word starts from lowercase, in this situation, all can work fine before the compilation and doesn't work at all after, because the PHP array-keys is a case-sensitive but namespaces is not case-sensitive.

Here is similar problem with a controller Uncaught TypeError: Argument 1 passed to [...] must be an instance of

  • @OscarRomin I was glad to help you! :) Commented Apr 7, 2017 at 13:29

Try the following code, this worked for me on many occasions for creating widgets.

public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        array $data = []
        parent::__construct($context, $data);

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