Re: Problem with LaTeX class scrlttr2

[Julius Dittmar]

How do you produce (or try to produce) LaTeX/pdf?

The Unknown LaTeX class message is something emacs throws when using 
export to latex (C-c C-e l l). This has nothing to do with your LaTeX 
installation; it does not reach the point of invoking LaTeX. It tells 
you there's no setup for scrlttr2 class in org-latex-classes. There is 
no setup for default-koma-letter either in my version of 
org-latex-classes. Perhaps you need to load ox-koma-letter in org first?

HTH,
Julius