SQLiteException: database disk image is malformed about sqliteforunity HOT 2 OPEN

private ISQLiteConnection _connection;
private DatabaseController()
{
    // We check the existance of the database. If it does not exists we create a new one.
    var factory = new ConnectionFactory();
// check if file exists in Application.persistentDataPath
filepath = string.Format("{0}/{1}", Application.persistentDataPath, DatabaseName);
if (!File.Exists(filepath))
{
        // Creating new database
        Debug.Log("Database not in Persistent path: creating new one");
        _connection = factory.Create(filepath);
        CreateScoreTable();
        LockDB();
        Debug.Log("Database written in " + filepath);
    }
    else { 
        dbPath = filepath;
        firstCreation = false;
        _connection = factory.Create(dbPath);
    }
    Debug.Log("Database succesfully load");
}

/// <summary>
/// Creating the score table. Method to use when we have created a new database.
/// </summary>
public void CreateScoreTable()
{
    _connection.CreateTable<YourTable>();
}

/// <summary>
/// Encripts the database
/// </summary>
public void LockDB()
{
    _connection.SetDbKey(Password);
}`