HKMA.CRMIntegration.API.DLL | Error migrating note to DMS: Value cannot be null.
Parameter name: s |

that’s the error I keep getting and I don’t know why. This is my code below

I already tried different methods but still not migrating to the DMSBaseUrl=https://skdmsitea01.intra.hkma.gov.hk/otcsapi/cs.exe/api/v1

EntityCollection accNoteCollection = service.RetrieveMultiple(accNoteQuery);
string destinationFolderPath = ConfigurationManager.AppSettings["DMSBaseUrl"];
foreach (Entity note in accNoteCollection.Entities)
{
    DMSService dmsService = new DMSService();
    try
    {
        string fileName = note.GetAttributeValue<string>("filename");
        if (fileName == null)
        {
            Console.WriteLine("Filename is null. Skipping this note...");
            continue;
        }
        string documentBody = note.GetAttributeValue<string>("documentbody");
        byte[] fileBytes = Convert.FromBase64String(documentBody);
        string accountName = account.GetAttributeValue<string>("name");
        string accountId = account.Id.ToString();

        // Create folder path using account name and object ID
        string destinationFolder = Path.Combine(destinationFolderPath, $"{accountName}_{accountId}");

        // Create the folder if it doesn't exist
        Directory.CreateDirectory(destinationFolder);

        // Specify the destination file path
        string destinationFilePath = Path.Combine(destinationFolder, fileName);

        // Check if the file already exists in the destination folder
        if (File.Exists(destinationFilePath))
        {
            // If file already exists
            Console.WriteLine($"File '{fileName}' already exists in the folder '{accountName}'. Skipping...");
            continue;
        }

        // If file doesn't exist, save to destination folder
        File.WriteAllBytes(destinationFilePath, fileBytes);
        Console.WriteLine($"Downloading '{fileName}' for account '{accountName}' with ID '{accountId}'");

        NodeModel nodeModel = new NodeModel()
        {
            entityId = account.Id,
            entityName = account.LogicalName,
            item_id = account.GetAttributeValue<Guid>("accountid").ToString(),
            item_name = fileName,
            meta_header = account.GetAttributeValue<string>("accountid"),
            meta_id = account.GetAttributeValue<string>("accountid"),
            meta_name = account.GetAttributeValue<string>("name")
        };

        ResponseModel response = await dmsService.createFolderAsync(nodeModel);

        if (response.ResponseCode == 200)
        {
            Console.WriteLine($"Note '{fileName}' migrated successfully to DMS. Note ID: {note.Id}");
            logger.Info($"Note '{fileName}' migrated successfully to DMS. Note ID: {note.Id}");
        }
        else
        {
            Console.WriteLine($"Failed to migrate note '{fileName}' to DMS. Error: {response.ResponseMessage}");
            logger.Error($"Failed to migrate note '{fileName}' to DMS. Error: {response.ResponseMessage}");
        }
    }
    catch (Exception ex)
    {
        logger.Error($"Error migrating note to DMS: {ex.Message}");
    }
}