问身份证OCR一直FailedOperation.DownLoadError？

try

{

Credential cred = new Credential

{

SecretId = "",

SecretKey = ""

};

ClientProfile clientProfile = new ClientProfile();

HttpProfile httpProfile = new HttpProfile();

httpProfile.Endpoint = ("ocr.tencentcloudapi.com");

clientProfile.HttpProfile = httpProfile;

OcrClient client = new OcrClient(cred, "ap-guangzhou", clientProfile);

IDCardOCRRequest req = new IDCardOCRRequest();

string strParams = "{\"ImageUrl\":\"D:\\\\Gitee\\\\C#\\\\Property Management System\\\\PMS\\\\PMS\\\\bin\\\\Debug\\\\PersonImguserImage.jpg\",\"CardSide\":\"FRONT\"}";

req = IDCardOCRRequest.FromJsonString<IDCardOCRRequest>(strParams);

IDCardOCRResponse resp = client.IDCardOCR(req).

ConfigureAwait(false).GetAwaiter().GetResult();

Console.WriteLine(AbstractModel.ToJsonString(resp));

}

catch (Exception e)

{

Console.WriteLine(e.ToString());

}

Console.Read();

请这段代码为什么出错啊