From mboxrd@z Thu Jan  1 00:00:00 1970
From: Renato <renatofdds@gmail.com>
Subject: Re: Bug: Priority #B in Agenda causes invalid face reference	[8.2.1
 (8.2.1-15-ge5cecc-elpa @	/Users/Paul/.emacs.d/elpa/org-20131021/)]
Date: Thu, 23 Apr 2015 18:21:45 -0300
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To: emacs-orgmode@gnu.org

I'm using release_8.2.10 and experienced the same problem.

The problem seems to be the function org-agenda-fontify-priorities which
calls:
(org-face-from-face-or-color
		       'priority nil
		       (cdr (assoc p org-priority-faces)))

which expects a face to inherit from. When org-priority-faces is nil or
color or even does not specify the priority(e.g. "B") it inherits from
nil and causes the message.
Setting it to something like 
   (quote
    ((65 . org-level-1)
     (66 . org-level-2)
     (67 . org-level-3)
     (68 . org-level-4))))

is a workaround to the problem.

Renato