Hello,

There was a problem with the last version of ox-koma-letter.el  , I have
replaced it with an old version:

;;; ox-koma-letter.el --- KOMA Scrlttr2 Back-End for Org Export Engine

;; Copyright (C) 2007-2012, 2014  Free Software Foundation, Inc.

and now the export works.

I hope that it will be helpful.

Best wishes,

Jo.

Le ven. 8 mars 2019 à 09:11, Joseph Vidal-Rosset <
joseph.vidal.rosset@gmail.com> a écrit :

> Hello,
>
> I'm trying to export to koma class,  and especially to get the export to
> koma letter but I meet always the same message:
>
> "org-koma-letter-template: Wrong type argument: char-or-string-p, nil"
>
> and I do  not succeed to see  what is wrong in my  setup. Therefore your
> help is welcome.
>
> Best wishes,
>
> Jo.
>