Siempre que te dé un error así, puedes hacer lo siguiente:
Ve a steamapps/workshop/content/311210/ y en este caso, te aparecerán carpetas según los artículos a los que estés suscrito, en este caso nos vamos el que tenga (2270791194) y en los primeros archivos verás unos que empiezan con (en), esto lo cambias por la abreviatura de tu idioma que sería (es) si hablas español.

Whenever it gives you an error like this, you can do the following:
Go to steamapps/workshop/content/311210 and in this case, folders will appear according to the articles to which you are subscribed, in this case we will go to the one that has (2270791194) and in the first files you will see some that start with (en), you change this to the abbreviation of your language which would be (es) if you speak Spanish.
(Translation with Google)

still can't play

Originally posted by Texzels:

still can't play

Before I said that you have to use the abbreviation of your language, how are you from france, in your case instead of (es), you have to put (fr) since that is the abbreviation of your language

already try still don't work

Did you try reinstalling and doing what I told you before?

Something like that should be your 2 files:
fr_zm_heroic_oasis_challenge.ff
fr_zm_heroic_oasis_challenge.xpak