Google Cloud Vision API "cannot use connPool" - go

I'm learning Google Cloud Vision API, but facing some issues. I have completely repeated all the steps from the 'Getting Started' Guide.
download/install google cloud SDK
activate login credentials using gcloud
Set the environment variable GOOGLE_APPLICATION_CREDENTIALS
Install the client library
After that I ran this code and got this error when compiling:
..\cloud.google.com\go\longrunning\autogen\operations_client.go:166:54: cannot use connPool (type "google.golang.org/api/internal".ConnPool) as type *"google.golang.org/grpc".ClientConn in argument to longrunning.NewOperationsClient
Compilation finished with exit code 2
I repeated all the steps over and over and still get this error. Windows 10 is installed on my pc with the latest software updates.
I have NOT changed the code from the tutorial.
Can anyone please tell me why I'm getting this error?

Issue has been fixed.
I just needed to remove conflicting custom imports and re-install Google Vision library.
Well that was a dumb mistake, sorry to bother you.

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I think modern Windows come with Linux now. Since the Internet runs on Linux, you might find development and following tutorials much easier if you use Linux, since all these inconveniences of Windows disappear. Unless you are already super handy with all the quirks of Windows to work around their results, it could be your ticket!
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