I would like to configure the material in a part family but I have an error message that I can't explain: " the value $BIBLIOTHEQUE:MATERIAUX@Clavette parallel DIN 6885 A in column N001_Materiaux:Steel C45E (1.1191) is invalid "
That's what I thought: Your materials are not associated with configurations.
Delete your Material column in your Excel sheet. (Pay attention to your cell references) Since then, in solidarity, in a configuration: Assign the desired material, then in " Config " select " For this Configuration ".