Hi Pedro, On 2024-03-07 10:03, Pedro Andres Aranda Gutierrez writes: > could you please try to add > > #+LATEX_CLASS: beamer > #+LATEX_CLASS_OPTIONS: [presentation,aspectratio=169] > > instead of > > (require 'ox-latex) > > (add-to-list 'org-latex-classes > '("my-beamer" > "\\documentclass\[presentation,aspectratio=169\]\{beamer\} > [NO-DEFAULT-PACKAGES]" > ("\\section\{%s\}" . "\\section*\{%s\}") > ("\\subsection\{%s\}" . "\\subsection*\{%s\}") > ("\\subsubsection\{%s\}" . "\\subsubsection*\{%s\}"))) > > and see if that makes any difference? Thank you for the suggestion. I tried this and it does not help, I have the same error. I do not know how to debug it since the error happens in compiled code whose origin is not given… The surprising part is that the problematic function was introduced very recently (https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=87c9f9b5db2e14fe0c5254105b7b90b01bbf8d61) but it seems to be used in the asynchronous export that does not load any package, so there I should be using the orgmode version shipped with emacs… Alan