Retrieve All Documents from all Subfolders in a Document Library - CSOM

I am using the client side object model approach C# in order to retrieve all list items from a document library containing sub folders. I checked out the MSDN documentation and I am stuck as to why I cannot get the field property, or if I am even doing this right.

    NetworkCredential credentials = System.Net.CredentialCache.DefaultNetworkCredentials;
            ClientContext clientcontext = new ClientContext(Resources.defaultSPSite);
            clientcontext.Credentials = credentials;

            //Load Libraries from SharePoint
            //Web site = clientcontext.Web;
            clientcontext.Load(clientcontext.Web.Lists);
            clientcontext.ExecuteQuery();


            //List sharedDocumentsList = clientcontext.Web.Lists.GetByTitle("TestLDOCS");
            //CamlQuery camlQuery = new CamlQuery();
            //camlQuery.ViewXml = @"<View Scope='Recursive'><Query></Query></View>";

            foreach (List list in clientcontext.Web.Lists)
            {
                clientcontext.Load(list);
                clientcontext.ExecuteQuery();
                //list.TemplateFeatureId.ToString().Equals("") &&
                    string baseType =  list.BaseType.ToString();
                    string listTitle = list.Title.ToString();
                    if (list.BaseType.ToString().Equals("DocumentLibrary", StringComparison.InvariantCultureIgnoreCase) && list.Title.ToString().Equals("TestLDOCS", StringComparison.InvariantCultureIgnoreCase))
                    {
                        foreach (Folder subFolder in list.RootFolder.Folders)
                        {
                            foreach (File f in subFolder.Files)
                            {
                                Console.WriteLine((string) f.Title);                     
                            }
                        }
                    }
             }
        }

The error that I am receiving