We are encountering this issue upon upgrade of Microsoft.AspNet.WebApi.Client to the latest version:
What worked so far is to downgrade the package to 5.2.9. From my research it is said that the nuget package System.Net.Http.Formatting was deprecated and removed from nuget for security issues. It should not be used and the replacement is Microsoft.AspNet.WebApi.Client.
So I am not sure as to why there's an error saying it cannot find the file specified when it should not be referenced directly as it's already included in the Microsoft.AspNet.WebApi.Client nuget package.