Errors during compilation

[MurKit]

I'm on Magento CE 2.1.7.

After I download this extension and copy it to my Magento installation I run some cli commands.

sudo rm -rf var/di/*
sudo rm -rf var/cache/*
sudo rm -rf var/generation/*
sudo rm -rf var/page_cache/*

sudo chmod -R 777 pub/*
sudo chmod -R 777 var/*

php -f bin/magento cache:clean
php bin/magento setup:upgrade
php bin/magento setup:di:compile

And on the last step there are errors:

Errors during compilation:
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Save.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Edit.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post.php
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
Total Errors Count: 3
Errors during compilation:
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Save.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Edit.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post.php
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
Total Errors Count: 3
Errors during compilation:
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Save.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Edit.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post.php
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
Total Errors Count: 3
Errors during compilation:
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Save.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Edit.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post.php
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
Total Errors Count: 3
Errors during compilation:
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Save.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Edit.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post.php
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
Total Errors Count: 3
Errors during compilation:
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Save.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Edit.php
\Magento\Backend\Model\Session already exists in context object
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
	Mageplaza\HelloWorld\Controller\Adminhtml\Post
		Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post.php
\Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
Total Errors Count: 3

[irinikp]

I get the exact same error

[NagarajuKasa]

Yes I am also facing the same issues http://prntscr.com/g3ubke

[tarungupta051]

Hello You need to below changes into files.

1. Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post.php
   \Magento\Backend\Model\View\Result\RedirectFactory already exists in context object

Reply : $this->redirectFactory = $context->getRedirectFactory();

comment below code : //\Magento\Backend\Model\View\Result\RedirectFactory $resultRedirectFactory,

use below code 👍
public function __construct(
\Mageplaza\HelloWorld\Model\Upload $uploadModel,
\Mageplaza\HelloWorld\Model\Post\File $fileModel,
\Mageplaza\HelloWorld\Model\Post\Image $imageModel,
//\Magento\Backend\Model\Session $backendSession,
\Mageplaza\HelloWorld\Model\PostFactory $postFactory,
\Magento\Framework\Registry $registry,
//\Magento\MediaStorage\Model\File\UploaderFactory $uploaderFactory,
/// \Magento\Backend\Model\View\Result\RedirectFactory $redirectFactory ,
\Magento\Backend\App\Action\Context $context
//Phpexcel_PHPExcel $xlsx
//\PHPExcel\IOFactory $iOFactory;
//Phpexcel_PHPExcel $xlsx

)
{
    $this->_uploadModel    = $uploadModel;
    $this->_fileModel      = $fileModel;
    $this->_imageModel     = $imageModel;
  //  $this->_backendSession = $backendSession;
	$this->redirectFactory =  $context->getRedirectFactory();
	//$this->_iOFactory = $iOFactory;
	//$this->excelFactory = $excelFactory;
	//$this->excelFactory = $excelFactory;
    parent::__construct($postFactory, $registry,$context);
}

[tarungupta051]

Hello ,

1. Incorrect dependency in class Mageplaza\HelloWorld\Controller\Adminhtml\Post\Save in /var/www/mage2/app/code/Mageplaza/HelloWorld/Controller/Adminhtml/Post/Save.php
   \Magento\Backend\Model\Session already exists in context object
   \Magento\Backend\Model\View\Result\RedirectFactory already exists in context object
   Mageplaza\HelloWorld\Controller\Adminhtml\Post\Edit

Reply : use below code 👍
public function __construct(
// \Magento\Backend\Model\Session $backendSession,
\Magento\Framework\View\Result\PageFactory $resultPageFactory,
\Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory,
\Mageplaza\HelloWorld\Model\PostFactory $postFactory,
\Magento\Framework\Registry $registry,
//\Magento\Backend\Model\View\Result\RedirectFactory $resultRedirectFactory,
\Magento\Backend\App\Action\Context $context
)
{
//$this->_backendSession = $backendSession;
$this->_resultPageFactory = $resultPageFactory;
$this->_resultJsonFactory = $resultJsonFactory;
$this->redirectFactory = $context->getRedirectFactory();
parent::__construct($postFactory,$registry,$context);
}