Thank you all, worked for me too.
Oddly, I didn't make any change by myself in the code, but I can see that the recipe has been been updated within Calibre, because the code is different from the version of january 2021 (see Github page :
https://github.com/lhoupert/calibre_...diapart.recipe).
Is it possible, even though I didn't updated the whole app (Calibre) ? @Kovid ?