Localization not working in builds

Hello, I am currently trying to add localization in my games to have 2 languages: english and french.

I followed a tutorial, and it now works in editor mode: I can change language using a dropdown and everything is gravy. But when I build my game, nothing works, and I have error messages in Development build's console.

Here are the errors when my project starts:

And when I try to change language with my dropdown menu:

I want to add that I only have 2 languages in my project and 2 options on my dropdown, and that my adressable assets are correctly located.

Here is the code of my dropdown menu:

 using System.Collections;
 using System.Collections.Generic;
 using TMPro;
 using UnityEngine;
 using UnityEngine.Localization.Settings;
 using UnityEngine.UI;
 
 public class ChangeLanguageMenu : MonoBehaviour
 {
     public TMP_Dropdown dropdown;
     public void Awake()
     {
         StartCoroutine(coroutineStart());
     }
 
     public IEnumerator coroutineStart()
     {
         yield return LocalizationSettings.InitializationOperation;
         if (LocalizationSettings.SelectedLocale == null)
         {
             LocalizationSettings.SelectedLocale = LocalizationSettings.AvailableLocales.Locales[0];
         }
         dropdown.value = LocalizationSettings.SelectedLocale.SortOrder;
     }
 
     //Called by a dropdown menu when I change the selection, I only have 2 language in this dropdown
     public void setLanguage(int languageNumber)
     {
         StartCoroutine(coroutineSetLanguage(languageNumber));
     }
     public IEnumerator coroutineSetLanguage(int languageNumber)
     {
         // Wait for the localization system to initialize, loading Locales, preloading, etc.
         yield return LocalizationSettings.InitializationOperation;
         LocalizationSettings.SelectedLocale = LocalizationSettings.AvailableLocales.Locales[languageNumber];
     }
 }

Thanks you in advance for your help.