------------------------------------------------------------------------
org-latex-title-command does not honor the document SUBTITLE or %s
substitution, and throws an error invalid format character %s.
Investigation showed that org-latex--format-spec did not have an entry
for %s. Making the obvious change appeared to resolve the issue:
#+BEGIN_SRC emacs-lisp
--- ox-latex.el~ 2020-02-07 13:59:34.804141887 -0500
+++ ox-latex.el 2020-02-07 14:00:18.836895973 -0500
@@ -1586,6 +1586,7 @@
lang))))
`((?a . ,(org-export-data (plist-get info :author) info))
(?t . ,(org-export-data (plist-get info :title) info))
+ (?s . ,(org-export-data (plist-get info :subtitle) info))
(?k . ,(org-export-data (org-latex--wrap-latex-math-block
(plist-get info :keywords) info)
info))
#+END_SRC
Emacs : GNU Emacs 26.3 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.24.13)
of 2019-12-10
Package: Org mode version 9.3.4 (9.3.4-elpa @
/home/srobertson/.emacs.d/elpa/org-20200206/)
