私はしばらくこれに取り組んでいましたが、原因が何であるかを理解できません。
Error 1 The type 'Google.Apis.Requests.IErrorResponseHandler' is defined in an assembly that is not referenced. You must add a reference to assembly 'Google.Apis, Version=1.2.4737.25313, Culture=neutral, PublicKeyToken=null'.
Error 2 The type 'Google.Apis.Authentication.IAuthenticator' is defined in an assembly that is not referenced. You must add a reference to assembly 'Google.Apis, Version=1.2.4737.25313, Culture=neutral, PublicKeyToken=null'.
Error 3 The type 'Google.Apis.Discovery.IRequestProvider' is defined in an assembly that is not referenced. You must add a reference to assembly 'Google.Apis, Version=1.2.4737.25316, Culture=neutral, PublicKeyToken=null'.