How to use the BackupRestoreUser and BackupRestoreTrades in Metatrader Manager API?

Question

I am tring to use the Metatrader Manager API to unarchive the user. I have the admin permission to do this process and I can unarchive users from the admin application. And the following is my code for the unarchive process,

public ClrWrapper Metatrader(string host, int login, string password, string apiPath)
{
    var param = new ConnectionParameters()
    {
        Server = host,
        Login = login,
        Password = password
    };
    return metatrader = new ClrWrapper(param, apiPath);
}

public void UnarchiveAccounts(int[] logins)
{
    StringBuilder builder = new StringBuilder();
    foreach(int login in logins)
    {

        if (login!=0)
        { builder.Append(login).Append(","); }

    }
    string request = builder.ToString();

    IList<BackupInfo> userInfo = metatrader.BackupInfoUsers(2);  
    IList<BackupInfo> orderInfo = metatrader.BackupInfoOrders(2);  

    IList<UserRecord> userRecords = new List<UserRecord>();
    List<TradeRecord> tradeRecords = new List<TradeRecord>();
    foreach (BackupInfo userInfoItem in userInfo)
    {
        if (userInfoItem.File.ToUpper().Contains("ARCHIVE"))
        {
            userRecords = userRecords.Concat(metatrader.BackupRequestUsers(userInfoItem.File, request)).ToList();

            if (userRecords.Count >= logins.Length)
            {
                break;
            }
        }

    }

    int userUnarchiveFlag = metatrader.BackupRestoreUsers(userRecords);
    string error = metatrader.ErrorDescription(userUnarchiveFlag);

    // restore trades
    foreach(BackupInfo orderInfoItem in orderInfo)
    {
        if(orderInfoItem.File.ToUpper().Contains("ARCHIVE"))
        {
            tradeRecords.AddRange(metatrader.BackupRequestOrders(orderInfoItem.File, request));
        }

    }

    IList<TradeRestoreResult> tradeRestore = metatrader.BackupRestoreOrders(tradeRecords);

}

I didn't use the pumping mode, the error code for BackupRestoreUser is 3, which means invalid paramater; the error code for BackupRestoreTrades is 2, which means common error. I've tried to solve this for hours but couldn't make any progress. I do appreciate any help from you guys.

Thank you!