Getting 'Not Found' error when publishing my first Hello World extension


I am new to business central. I am getting below error when publishing first HelloWorld extension

The request for path /v2.0/sandbox/dev/packages?publisher=Microsoft&appName=System%20Application&versionText= failed with code NotFound. Reason: Not Found

What I am missing here? Any help much appreciated. Thanks

When I goto Problems tab on ‘Visual Studio Code’, I see following message

The package cache c:\Dynamics\Sales Inv./.alpackages could not be found.

I would Clear the credentials and download the symbols again. It happens with me as well sometimes,I create a new connection.

Can you send us your Launch.json as well?
have you downloaded symbols?

if the .alpackages do not have the basenav extensions you will need to download those.