Fatal Error Call to a member function dispatch() while call my Block in magento 2

Question

This is my Block File:

 <?php
 namespace ChennaiBox\Mymail\Block\Mail;
 class MailContent extends \Magento\Framework\View\Element\Template
 {
 protected $_objectManager;
 protected $customerSession;
 public function __construct(
 \Magento\Customer\Model\Session $customerSession, 
 \Magento\Framework\ObjectManagerInterface $objectManager
 ) {
 $this->customerSession = $customerSession;
 $this->_objectManager = $objectManager;
 }
 public function mymailData()
 {
try{
 if ($this->customerSession->isLoggedIn()) {
 $cutomerEmail =(string)$this->customerSession->getCustomer()->getEmail();
 echo $cutomerEmail;
 else{
 $this->_redirect('customer/account/login/');
 }
 }catch (Exception $e) {
 $e->getMessage();
 }
 }
 }

If I call this block I get error

PHP Fatal error: Call to a member function dispatch() on null in /var/www/html/magento2/vendor/magento/framework/View/Element/AbstractBlock.php on line 642, referer: http://magentodev.gworks.mobi/magento2/customer/account/index/

from apache error.log file., why, suggect me how to solve this problem.

Answer 1

The problem is that your constructor does not match the parent class constructor.

To fix that you need to update your constructor:

public function __construct(
 \Magento\Framework\View\Element\Template\Context $context,
 \Magento\Customer\Model\Session $customerSession, 
 \Magento\Framework\ObjectManagerInterface $objectManager,
 array $data = []
 ) {
 parent::__construct($context, $data);
 $this->customerSession = $customerSession;
 $this->_objectManager = $objectManager;
 }

Don't forget to flush the var/cache and var/generation after your changes.

• siliconrockstar: Thank you. This helped me with one of those 'I know I'm forgetting something but I can't remember what' situations.