From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
Subject: Re: Bug: cannot export to beamer, even with (require 'ox-beamer)
 [9.1.14 (release_9.1.14-1059-gadec50 @
 /home/oub/emacs/site-lisp/packages/org/)]
Date: Mon, 17 Dec 2018 13:07:41 -0500
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Uwe Brauer <oub@mat.ucm.es> writes:

> I have  
> (require 'ox-beamer) 
>
> In my org init file, which should via add-to-list, add beamer but somehow
> it does not. 
>
> So when I call 
>
> C-c C-e l b
>
> In a org file I obtain the message
>
> user-error: Unknown LaTeX class ‘beamer’
>
> Something is wrong here. Add-to-list should add beamer to the org-class
> but somehow it does not.
> I am not sure who is to blame. Org or customize?
>

You are probably loading ox-beamer which adds it and then loading the
customized version which resets it. Try changing the order.

-- 
Nick

"There are only two hard problems in computer science: cache
invalidation, naming things, and off-by-one errors." -Martin Fowler