Nicolas Goaziou <n.goaziou@gmail.com> writes:

> Hello,
>
> Eric Schulte <schulte.eric@gmail.com> writes:
>
>> When I attempt to export a .org file to Beamer (with "C-c C-e l b" after
>> requiring ox-beamer) I get the following error [1].  From the info page
>> (info "(org)Beamer export") it looks like I shouldn't have to do any
>> special buffer preparation.
>>
>> What am I doing wrong?
>
> It looks like `org-beamer-outline-frame-options' is nil, but it must be
> a string (possibly empty).
>

Thanks, with this variable set to an empty string I am making it further
in the export process.  I would suggest that either the initial value of
this variable be set to an empty string, or a nil value should be
handled gracefully.

After fixing the above I reached a new error.  There was no "beamer"
class defined in my `org-latex-classes'.  The attached patch ensures
that when ox-beamer is loaded a beamer entry is added to
`org-latex-classes' if none already exists.