Fieldset parameter is retrieved but is null

[ebuddy]

Thank you very much @froschdesign , This is what I used and I solved it partially but I’m facing to a new problem I posted 8m ago. See the link below please :

Laminas fieldset unable to use custom select with where clause

I have a laminas form wich contains a fieldset. In this fieldset, I have a custom select Element wich is populate from database with a where clause depending on parameter passed to my fieldset. However, when I use my custom Select, I get this error message <<Argument 1 passed to Laminas\ServiceManager\ServiceManager::Laminas\ServiceManager{closure}() must be of the type string, object given, called in…>>. I post my code below : My fieldset here : <?php /** * @module Commun * @subp…