From mboxrd@z Thu Jan  1 00:00:00 1970
From: Josiah Schwab <jschwab@gmail.com>
Subject: Re: cannot export to beamer.
Date: Sat, 15 Dec 2018 10:14:10 -0800
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To: emacs-orgmode@gnu.org

Hi Uwe,

> Now I took the example
> https://orgmode.org/manual/A-Beamer-example.html#A-Beamer-example
>
> And wanted to export it to beamer but obtained the message=20
> user-error: Unknown LaTeX class =E2=80=98beamer=E2=80=99

This sounds to me like you are using the latex exporter, rather than the
beamer one.

After

  (require 'ox-beamer)

then

  C-c C-e l b

works well on the example for me.

Josiah