My guess is that you are hitting a bug where in some system configurations, cloning a public project can fail with this error if you haven’t logged into Github in AI Workbench (either during install for from the Settings screen).
This has been fixed in our upcoming release. To workaround this, log into github and this error should go away.
Im on mac and having the exact same issue. When I restart and disconnect and reconnect my 3rd party creds it still gives me same error I am on the latest version. meaning this bug is not solved.