Although I use the correct namespace a wrong instance is passed to the constructor

Question

I have a block php file. Block File Code:

<?php

namespace Vendor\SampleModule1\Block;

use Magento\Framework\View\Element\Template;
use Magento\Framework\View\Element\Template\Context;
use Vendor\SampleModule1\Model\ResrouceModel\Item\Collection;
use Vendor\SampleModule1\Model\ResrouceModel\Item\CollectionFactory;

class Hello extends Template
{
    private $collectionFactory;

    public function __construct(
        Context $context,
        CollectionFactory $collectionFactory,
        array $data =[]
    )
    {
        $this->collectionFactory = $collectionFactory;
        parent::__construct($context, $data);
    }

    /**
     * @return \Vendor\SampleModule1\Model\Item[]
     */
    public function getItems()
    {
        return $this->collectionFactory->create()->getItems();
    }
}

When I try to see the view the error is

Fatal error: Uncaught TypeError: Argument 1 passed to Vendor\SampleModule1\Block\Hello::__construct() must be an instance of Magento\Framework\View\Element\Template\Context, instance of Magento\Framework\ObjectManager\ObjectManager given ....

How is that possible ? ? ?

Answer 1

You need to compile your code after you have done changes.

Please do

php bin/magento setup:di:compile