InsertMediaUpload Service BaseUri ArgumentNullException

Question

我想使用C＃将一组文件上传到不同项目的Google云存储中，但是，我的一些文件已成功上传，我的一些文件抛出异常说：“Google Cloud Storage InsertMediaUpload Service BaseUri ArgumentNullException”。有谁知道导致此错误的原因，以及如何解决？ 这是我正在使用的代码：

static void main(string[] args)
{
 string[] paths = Directory.GetFiles(@"C:\Users\Downloads\csv");    
            List<Task> tasks = new List<Task>();
            var sw = Stopwatch.StartNew();
            foreach (string path in paths)
            {
                tasks.Add(Task.Factory.StartNew(() =>
                {
                    StorageUploader st = new StorageUploader();
                    string filename = Path.GetFileName(path);
                    int i = Convert.ToInt32(filename.Substring(8,1));
                    string projectID = "abc" + i.ToString("00");
                    st.StorageUpload(path,pojectID,credentials[i]);
                }));
            }
            Task.WaitAll(tasks.ToArray());
            Console.WriteLine(sw.ElapsedMilliseconds);
            sw.Stop();

            Console.WriteLine("Done!");
            Console.Read();
        }
}

StorageUpload中的

（file，projectID，Credential）：

public void StorageUpload(string filePath,string project,StorageService aService)
        {
            var filename = Path.GetFileName(filePath);


            var projectName = project;
            var num = projectName.Substring(14,1);
            var bucketToUpload = "myBucket" + num;
            var newObject = new Google.Apis.Storage.v1.Data.Object()
            {
                Bucket = bucketToUpload,
                Name = filename
            };

            FileStream fileStream = null;
            try
            {

                fileStream = new FileStream(filePath, FileMode.Open);
                fileStream.Position = 0;          
                var uploadRequest = new Google.Apis.Storage.v1.ObjectsResource.InsertMediaUpload(aService, newObject,
                bucketToUpload, fileStream, "application/vnd.ms-excel");
               uploadRequest.UploadAsync();
               var stats = uploadRequest.GetProgress().Status;
               while (true)
               {
                   if (uploadRequest.GetProgress().Status.ToString() == "Completed")
                   {

                       return;

                   }
                   else if (uploadRequest.GetProgress().Status.ToString() == "Failed")
                   {
                       Console.WriteLine(filename + uploadRequest.GetProgress().Exception.ToString());
                   }
                   Console.WriteLine("Wait");
                   System.Threading.Thread.Sleep(10000);

               }

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                if (fileStream != null)
                {

                    fileStream.Dispose();
                }
            }

        }

提前多多感谢。