mageprince / magento2-FAQ

Controller/Adminhtml/FaqGroup/Index.php

<?php
/**
 * MagePrince
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the mageprince.com license that is
 * available through the world-wide-web at this URL:
 * https://mageprince.com/end-user-license-agreement
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade this extension to newer
 * version in the future.
 *
 * @category    MagePrince
 * @package     Mageprince_Faq
 * @copyright   Copyright (c) MagePrince (https://mageprince.com/)
 * @license     https://mageprince.com/end-user-license-agreement
 */

namespace Mageprince\Faq\Controller\Adminhtml\FaqGroup;

use Magento\Backend\App\Action\Context;

The type Magento\Backend\App\Action\Context was not found. Maybe you did not declare it correctly or list all dependencies?

use Magento\Framework\Controller\ResultInterface;

The type Magento\Framework\Controller\ResultInterface was not found. Maybe you did not declare it correctly or list all dependencies?

use Magento\Framework\View\Result\PageFactory;

The type Magento\Framework\View\Result\PageFactory was not found. Maybe you did not declare it correctly or list all dependencies?

class Index extends FaqGroup
{
    /**
     * @var PageFactory
     */
    protected $resultPageFactory;

    /**
     * Index constructor.
     * @param Context $context
     * @param PageFactory $resultPageFactory
     */
    public function __construct(
        Context $context,
        PageFactory $resultPageFactory
    ) {
        $this->resultPageFactory = $resultPageFactory;
        parent::__construct($context);
    }

    /**
     * Index action
     *
     * @return ResultInterface
     */
    public function execute()
    {
        $resultPage = $this->resultPageFactory->create();
        $resultPage->getConfig()->getTitle()->prepend(__("FAQ Group"));

The function __ was not found. Maybe you did not declare it correctly or list all dependencies?

        $resultPage->setActiveMenu('Mageprince_Faq::menu');
        return $resultPage;
    }
}