LaTeX3 Error: Backend request inconsistent with engine: using 'pdfmode'

Kornel Benko kornel at
Mon Feb 3 15:29:34 UTC 2020

This is for instance with examples/Presentations/Foils.lyx trying to use pdflatex.
Same error witth lualatex.
OTOH, if compiled first to dvi, also pdflatex and lualatex compile fine.

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