Unity button desabling not working on Android device

I am using Unity for the first time.

I am making a app to work on Android platform.

I made a script to add to one button. The interface has a text input field to add names of a group. After writing some name and hit one button (adicionar), it should add the name in a text field (named textoGrupo). It would also enabled a second button (named seguinte), that would be disabled since the begining of the script execution. I also have another text field (textoElementoRepetido) that should have text only if the name written is repeated.

It works fine when I tested it in Unity. But when I test it on my Android device it does nothing of what's on the script.

Here is my code:

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using System.Data; using Mono.Data.SqliteClient; using TMPro; using System.IO;

public class grupo : MonoBehaviour { List elementos = new List(); private IDbConnection connection; private IDbCommand command; string dbFile;

 int idGrupo = 0;
 public TMP_InputField input;
 public TMP_Text textoGrupo;
 public TMP_Text textoElementoRepetido;
 public Button seguinte;


 // Start is called before the first frame update
 IEnumerator Start()
 {
     
     // Ligação à base de dados
     string filepath = Application.persistentDataPath + "/TVdatabase.db";

     if (!File.Exists(filepath))

     {
         // if it doesn't ->
         // open StreamingAssets directory and load the db ->
         WWW loadDB = new WWW("jar:file://" + Application.dataPath + "!/assets/TVdatabase.db");  // this is the path to your StreamingAssets in android

         while (!loadDB.isDone)
         {
             yield return new WaitForSeconds(30);
         }  // CAREFUL here, for safety reasons you shouldn't let this while loop unattended, place a timer and error check

         // then save to Application.persistentDataPath

         File.WriteAllBytes(filepath, loadDB.bytes);

     }

     //open db connection

     connection = new SqliteConnection("URI=file:" + filepath);

     seguinte.interactable = false;

 }

 public void AdicionaElemento( )
 {
     if (input.text != null && input.text != "")
     {
         string sql;

         //se ainda não existirem elementos no grupo, é criado na base de dados um grupo e o seu id é guardado

         if (elementos.Count == 0)
         {
             command = connection.CreateCommand();
             connection.Open();

             sql = "INSERT INTO Grupo(idAvatar) VALUES(1);";
             command.CommandText = sql;
             command.ExecuteNonQuery();

             sql = "SELECT MAX(idGrupo) FROM GRUPO;";
             command.CommandText = sql;
             IDataReader reader = command.ExecuteReader();

             while (reader.Read())
             {
                 idGrupo = reader.GetInt32(0);
             }
             connection.Close();
         }
         string elemento = input.text.ToString();

         if (!elementos.Contains(item: elemento))
         {
             textoElementoRepetido.text = "";

             command = connection.CreateCommand();
             connection.Open();

             sql = "INSERT INTO Elemento(nomeElemento, idGrupo) VALUES('" + elemento + "', " + idGrupo + ");";

             command.CommandText = sql;
             command.ExecuteNonQuery();

             connection.Close();

             if (elementos.Count == 0)
             {
                 textoGrupo.text += elemento;
             }
             else
             {
                 textoGrupo.text += ", " + elemento;
             }
             elementos.Add(elemento);
             seguinte.interactable = true;
             input.text = "";
         }
         else
         {
             textoElementoRepetido.text = "Essa pessoa já faz parte do teu grupo!";
         }
     }
      else{
          seguinte.interactable = false;
      }
 }


 // Update is called once per frame
 void Update()
 {
     
 }

}

I hope I wrote enough to understand the purpose of this screen. Here is what I attached to the button adicionar.

attached on button

If first tried it on the onClick() event. Didn't work. So I tried it on a trigger. Same result.

I have no idea why this works on unity editor but not on my Android device and I really need to make this work in some time really soon. Can someone please help me?

Update I now know that the problem is somewhere in the data base connection. Because the script works fine when I press the button Adicionar without anything on the text input field.

I also have this question here with more updates.