From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Harkins < jamshark70@gmail.com>
Subject: Re: Bug: Wrong type argument: arrayp, nil when exporting to beamer
 [8.2 (8.2-elpa <at> /Users/jason/.emacs.d/elpa/org-20130919/)]
Date: Mon, 23 Sep 2013 00:54:03 +0000 (UTC)
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Jason Lewis <jason <at> dickson.st> writes:

> Nicolas Goaziou wrote, On 23/09/2013 7:56 AM:
> > The syntax is wrong: you cannot have two frames within the same
> > tree.
> 
> Hi Nocolas,
> 
> Thanks. The error message is not very clear and this is an easy
> mistake for a beginner to make.

FWIW, I've been using the new beamer exporter for at least half a year, and 
I'm convinced the simplest way to handle frames is to set the H: export option 
to the heading level that you want to turn into frames. That is, typically I 
use top-level headings for sections, and my slideshows haven't been long 
enough yet to need subsections, so I set H:2 in one of the #+OPTIONS strings 
at the top. Then all "** Second level headings" become frames. No need to 
specify the beamer_env in the properties drawer.

It isn't always the case, but it does seem often to be true that simpler input 
avoids problems.

Hope that helps.

hjh