Clicking on "Download PDF" on the page of Invoice the following error appears:
Template is not found. Can not send notification.
Notification template, specified as "PDF Template" in Common notification settings is absent (was deleted) or inactive.
1) Check "Invoice" PDF template name in :
Home > System > Settings > Notifications > Common Notification Settings
2) Find and open the template in question:
Home > System > Settings > Notifications > Notification Templates
A) verify that it is available, and has the same template name B) Verify that it is Active