The loginError.xhtml page of Duke's Tutoring currently says the following (in the English version):
Please enter a user name or password that is authorized to access this application. For this application, this means a user that has been created in the <code>file</code> realm and has been assigned to the <em>group</em> of <code>admins</code>.
In actuality the user is created in the tutoringRealm realm and assigned to the group Administrator. The various messages files must be changed to reflect this. (The non-English ones currently say that the user must be in the TutorialUser group.)