Related to this- Newsletter Checkbox on contact us page in magento 2

I am using magento 2.1.7 version. I created this module and it gives me error as:-

Fatal error: Uncaught TypeError: Argument 1 passed to Stackoverflow\Contact\Helper\Data::__construct() must be an instance of Magento\Framework\App\Helper\Context, instance of Magento\Framework\ObjectManager\ObjectManager given, called in G:\xampp2\htdocs\magento2\test\vendor\magento\framework\ObjectManager\Factory\AbstractFactory.php on line 93 and defined in G:\xampp2\htdocs\magento2\test\app\code\Stackoverflow\Contact\Helper\Data.php:34 Stack trace: #0 G:\xampp2\htdocs\magento2\test\vendor\magento\framework\ObjectManager\Factory\AbstractFactory.php(93): Stackoverflow\Contact\Helper\Data->__construct(Object(Magento\Framework\ObjectManager\ObjectManager)) 1 G:\xampp2\htdocs\magento2\test\vendor\magento\framework\ObjectManager\Factory\Compiled.php(88): Magento\Framework\ObjectManager\Factory\AbstractFactory->createObject('Stackoverflow\Co...', Array) #2 G:\xampp2\htdocs\magento2\test\vendor\magento\framework\ObjectManager\ObjectManager.php(71): Magento\Framework\ObjectManager\Fac in G:\xampp2\htdocs\magento2\test\app\code\Stackoverflow\Contact\Helper\Data.php on line 34.

How to fixed this?


2 Answers 2


It is showing that your helper is not using Magento\Framework\App\Helper\Context class instance.

Please clear cache, generation folder too.

Update code like this.

 public function __construct(
    \Magento\Framework\App\Helper\Context $context
  • Thanks. I am working on developer mode. When i apply above change and by deleting var/generation, var/di folders it is working fine. But when i upgrade,compile and deploy it shows previous same error message. How to fix this to compatible with upgrade/compile process?? I used like:- public function __construct( \Magento\Framework\App\Helper\Context $context, Session $customerSession, Subscriber $subscriber ) { $this->customerSession = $customerSession; $this->subscriber = $subscriber; parent::__construct($context); } Aug 30, 2017 at 11:36
  • After deploy and compile , once again you need to clear cache folder, because after compile still your var/generation folder contain old data (static). please read the magento 2 offical documentation for more details. Aug 30, 2017 at 11:47
  • I tried with this. Unfortunately it is not working. Enabled production mode and checked. But same error. Aug 30, 2017 at 13:01

If your M2 mode is on develop mode then remove var/generation and var/di folder


fire below command in your magento root directory

php bin/magento setup:di:compile 

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