Hi @anthony.cartaLB7C7,
Welcome to the Dynamo Community.
You cannot have a variable name with spaces in it.
So NUMERO DE LA FEUILLE will not work. It has to be NUMERO_DE_LA_FEUILLE or NUMERO-DE-LA-FEUILLE or something like that (but no spaces in between)
Also, you should use NUMERO_DE_LA_FEUILLE[0] (with square brackets) and not (0) round brackets.
