I'm trying to send emails using observer triggers, but I'm having problems with _transportBuilder (I can't get TransportBuilder instance). I'm catching customer_save_after_data_object event and calling my custom class (it's working), but when I try to execute $transport = $this->_transportBuilder... I found issues.

public function execute(\Magento\Framework\Event\Observer $observer)
    $vars = array();

    $transport = $this->_transportBuilder
        ->setTemplateIdentifier(1) // My email template
        ->setTemplateOptions( [
            'area' => \Magento\Framework\App\Area::AREA_FRONTEND, // this is using frontend area to get the template file if admin then \Magento\Backend\App\Area\FrontNameResolver::AREA_CODE
            'store' => \Magento\Store\Model\Store::DEFAULT_STORE_ID,
        ->setFrom('[email protected]', 'Test')
        ->addTo('[email protected]', 'Somepeople')


Fatal error: Uncaught Error: Call to a member function setTemplateIdentifier() on null in /opt/bitnami/apps/magento/htdocs/app/code/Company/mail/Observer/SendMail.php:62 Stack trace:

#0 /opt/bitnami/apps/magento/htdocs/vendor/magento/framework/Event/Invoker/InvokerDefault.php(73): Company\mail\Observer\SendMail->execute(Object(Magento\Framework\Event\Observer))

#1 /opt/bitnami/apps/magento/htdocs/vendor/magento/framework/Event/Invoker/InvokerDefault.php(61): Magento\Framework\Event\Invoker\InvokerDefault->_callObserverMethod(Object(Company\mail\Observer\SendMail), Object(Magento\Framework\Event\Observer))

#2 /opt/bitnami/apps/magento/htdocs/vendor/magento/framework/Event/Manager.php(66): Magento\Framework\Event\Invoker\InvokerDefault->dispatch(Array, Object(Magento\Framework\Event\Observer))

#3 /opt/bitnami/apps/magento/htdocs/var/generation/Magento/Framework/Event/Manager/Proxy.php(95): Magento\Framework\Event\Manager->dispatch('customer_save_a...', Array)

#4 /opt/bitnami/apps/magento/htdocs/vendor/magento/mo in /opt/bitnami/apps/magento/htdocs/app/code/Company/mail/Observer/SendMail.php on line 62


I've tried to start setting "TemplateOptions" or "TemplateVars" and I've got the same problem. I believe the error is with the instance not found.

Links (Questions followed):


2 Answers 2


I was having problems with $transportBuilder on __construct() and I removed all var/generation/* and compiled again and worked.

rm -rf [MAGENTO_PATH]/var/generation/*

  • yes sometimes it picks data from cache so you need to clear cache to see your changes.
    – Gulshan
    Commented Mar 21, 2017 at 8:39
  • @Gulshan Yes! You're right. But fortunately, it worked. Thank you! Commented Mar 22, 2017 at 4:03

I have just followed the first link you shared. Please check their construct:

public function __construct( \Magento\Framework\Mail\Template\TransportBuilder $transportBuilder){
    $this->_transportBuilder = $transportBuilder;

You haven't created transbuilder instance so it was throwing error. Please check and revert.

  • I did it! I found the problem.. The is with another thing... Thank you! Commented Mar 21, 2017 at 1:45
  • Welcome and happy coding. :)
    – Gulshan
    Commented Mar 21, 2017 at 1:46

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