Looks like there is a typo in templates/opac/myopac/test_notification.tt2 - [% l(a'n email') %] should be [% l('an email') %].
Looks like there is a typo in templates/ opac/myopac/ test_notificati on.tt2 - [% l(a'n email') %] should be [% l('an email') %].