Error message seen (java.lang.String cannot be cast to java.lang.Integer)

Bonjour chers tous, j’ai un message d’erreur qui m’empêche de continuer mon formulaire. Le message qui s’affiche sur l’écran du téléphone est le suivant:
java.lang.String cannot be cast to java.lang.Integer

Merci beaucoup

Could you let us know on when you get this error message? Is it when collecting your data or when designing your survey project?

Hello @Zeubien,
Could you also share the related part of your form (XLS), please?
Does this part work well in KoBo Preview?
Did you check your form with the online validator?