Got error on Blazor Example project

[jeffersyuan1976]

Hello, Sir,
When I pull the code, and run the blazor example project,
(https://github.com/grpc/grpc-dotnet/blob/master/examples/Blazor/Client/Program.cs)

I got the following error When I click the start button of couter page:

Status(StatusCode="intemal", Detail="Error starting aRPC cal. HtpRequestException: TypeError. Failed to fetch JSExceptionTypeError. Failed to fetch", DebugException="System.Net.Http.HttpRequestException: TypeError. Failed to fetch"

Any ideas about this error?

Thanks.