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From: Charles Millar <millarc@verizon.net>
Subject: Problem
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I am attempting to use ox-koma-letter, etc.

My set up

GNU Emacs 28.0.50 (build 84, x86_64-pc-linux-gnu, GTK+ Version 3.24.14, 
cairo version 1.16.0) of 2020-04-03
Org mode version 9.3.6 (release_9.3.6-449-gb99357 @ 
/usr/local/share/org-mode/lisp/)

org-latex-classes includes

"default-koma-letter" "\\documentclass[11pt]{scrlttr2}"

There are no other entries that include scrlttr2 in org-latex-classes

I have a barebones header

#+LATEX_CLASS: scrlttr2 (I also have tried 'default-koma-letter')

and then entered the Romeo to Juliet letter

and i receive the following error

Unknown LaTex class scrlttr2

I searched the list and one suggested problem does not seem to be 
applicable - I do not have a mixed org installation.

Any suggestions.

Charlie Millar