Expresso:Store - Undefined Property on checkout

Question

I've just doing some final tests before go live and when I complete at the checkout I receive the following error:

A PHP Error was encountered    
Severity: Notice    
Message: Undefined property: EE::$template    
Filename: libraries/store_emails.php    
Line Number: 68    
Fatal error: Call to a member function parse_variables() on a non-object in ~/expressionengine/third_party/store/libraries/store_emails.php on line 68

The order completes - as far as to say it's in the CP orders page, but clearly the email function is failing and preventing usual redirect.

All other emails (HTML / Plain Text) work fine, the email debug passes.

I've replaced the default email template with simply {order_id} and again with just 'test' to rule out any conditions - and I still get the same error.

EE - 2.5.5 / Store - 1.6.2 / Payment Gateway - None

Answer 1

Adrian was right... forgot to check our custom module we built that hooks into the checkout process. We corrected the template lib and all is well.

Changed -

 $email['subject'] = $this->EE->template->parse_variables($email['subject'], $tag_vars);

to

 $email['subject'] = $this->EE->TMPL->parse_variables($email['subject'], $tag_vars);

As I say, this was a custom module, not Store - so nothing amiss with exp:resso