When an extra category is selected during an event creation the following error appears “Argument « category » has invalid value $category.” and the event cannot created. In addition the extra category appear correcly in the list. Mobilizon 5.2.3. Any idea ?
Hello,
Which instance are you using?
I don’t face any issue with the latest version (demoed in https://tests.keskonfai.fr/)
My instance is agenda.lagraine34.org. could share an example of the extra category is config.esx. Perhaps I’m doing wrong.. Thanx in advance for your support.
Elle a l’air sympa cette instance 
C’est bien ce bout de doc que tu as utilisé? Instance personalization - Mobilizon
A priori c’est celui qui est utilisé sur https://kids.keskonfai.com/ et ça ne génère pas d’erreur… Je ne sais pas si ça t’aide de savoir ça 
yes I did, I followed the documentation and see my configuration in the section instance : extra_categories: [
%{id: :animation, label: « Animation »},
%{id: :festival, label: « Festival »},
%{id: :stand, label: "Stand"},
%{id: :test, label: "Test"}
],
Again, I can see the extra catergories in the list but when I validate the event creation I the error message appear.. could you share a config.exs file ?