From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ken Mankoff <mankoff@gmail.com>
Subject: how to debug Archive view in custom agenda
Date: Fri, 11 Apr 2014 18:07:36 +0200
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when I try to view the Archive (v A) in my custom agenda view, I get an
error: 

Rebuilding agenda buffer...
org-refresh-properties: Wrong type argument: integer-or-marker-p, nil

When I view Archive in the timeline for a single Org file (C-c a L v A)
it works just fine.

How do I debug the above message to determine what might be the cause of
the error?

Thanks,

  -k.