The remote name could not be resolved: 'packagesource' Retrying 'FindPackagesByIdAsyncCore' for source 'https://packagesource/FindPackagesById()?id='System.Reflection'&semVerLevel=2.0.0'. An error occurred while sending the request.

I tried to clear the NuGet cache, and I checked the packages sources in settings and I still have the error. This is happening on all my Angular ASP.NET Core projects.