azure stack market syndication fail to import

Hi Guys,

I am having issue to do manual market item imports. As my company internet line for the Dev box is slow, so I opted to use personal internet to download from home.
The upload was done but the moment it finish, it jumps to error and it keep repeating none stop.

Stamp version: ASDK 1.2002.0.35

2020-07-08T16:02:52 [INFO] Upload succeeded, productName: microsoft.windowsserver2019-datacenter-byol-17763.1158.2004131759, fileName:
 osDiskImage\vhd_server_serverdatacenter_en-us_vl_127gb_azuregallery_fixed.vhd, elapsedTime: 01:05:39.6141963
2020-07-08T16:02:53 [ERROR] One or more errors occurred.
System.AggregateException: One or more errors occurred. ---> System.ArgumentNullException: Value cannot be null.
Parameter name: source
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at Microsoft.AzureStack.SyndicationClient.Jobs.UploadProductJob.GetPayload()
   at Microsoft.AzureStack.SyndicationClient.Jobs.UploadProductJob.<Upload>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AzureStack.SyndicationClient.App.<UploadCommandHandler>d__9.MoveNext()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at Microsoft.AzureStack.SyndicationClient.App.Main(String[] args)
---> (Inner Exception #0) System.ArgumentNullException: Value cannot be null.
Parameter name: source
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at Microsoft.AzureStack.SyndicationClient.Jobs.UploadProductJob.GetPayload()
   at Microsoft.AzureStack.SyndicationClient.Jobs.UploadProductJob.<Upload>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AzureStack.SyndicationClient.App.<UploadCommandHandler>d__9.MoveNext()<---