The groupIterator pseudoconstant was removed in 4.7.13

[drifteaur]

Since upgrading to CiviCRM 4.7.13 I'm getting the following error:

Call to undefined method CRM_Core_PseudoConstant::groupIterator() in [...]/civicrm_extensions/com.imba.sendgrid/CRM/Contact/Form/Search.php on line 503

This method was removed, see:

civicrm/civicrm-core@5390f75

[jenlampton]

We're having the same problem