IApplicationBuilder UseCookieAuthentication扩展方法在哪里？

我下载了一个私人的git项目，其他开发者一直在努力几个月。在构建项目时，遇到以下几个问题：IApplicationBuilder UseCookieAuthentication扩展方法在哪里？

要最初恢复软件包，我需要从命令行执行dnu restore。从Visual Studio 2015中恢复包似乎很好。
一个项目在.cs文件中仍然有一些缺失引用。我通过将软件包添加到相应的project.json文件来修复它。

现在我只剩下一个错误： IApplicationBuilder does not contain a definition for 'UseCookieAuthentication ...

代码期望一个匿名函数：

app.UseCookieAuthentication(options => 
{ 
    options.AuthenticationScheme = "NLCookieMiddleware"; 
    options.LoginPath = new PathString("/api/Account/Login/"); 
    //options.AccessDeniedPath = new PathString("/Account/Forbidden/"); 
    options.AutomaticAuthenticate = true; 
    options.AutomaticChallenge = true; 
});

有什么困惑，我的是，其他开发人员版本是不罚款在其project.json文件中添加了其他任何引用。对他们来说，工作文件是：

{ 
    "webroot": "wwwroot", 
    "version": "1.0.0-*", 
    "dependencies": { 
    "AutoMapper": "3.3.1", 
    "Core": "1.0.0-*", 
    "Data.EF": "1.0.0-*", 
    "FluentMigrator": "1.6.0", 
    "HtmlAgilityPack": "1.4.9", 
    "Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final", 
    "Microsoft.AspNet.Hosting": "1.0.0-rc1-final", 
    "Microsoft.AspNet.Identity": "3.0.0-rc1-final", 
    "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-rc1-final", 
    "Microsoft.AspNet.Identity.Owin": "1.0.0-rc1", 
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final", 
    "Microsoft.AspNet.Mvc.Core": "6.0.0-rc1-final", 
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final", 
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final", 
    "Microsoft.AspNet.Server.WebListener": "1.0.0-rc1-final", 
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final", 
    "Microsoft.Extensions.Configuration.Abstractions": "1.0.0-rc1-final", 
    "Microsoft.Extensions.Configuration": "1.0.0-rc1-final", 
    "WindowsAzure.Storage": "5.0.0", 
    "System.Net.Http": "4.0.0", 
    "RazorEngine": "4.2.3-beta1", 
    "Microsoft.AspNet.Razor": "4.0.0-rc1-final", 
    "premailer.net": "1.4.2", 
    "Microsoft.Net.Http.Client": "1.0.0-beta6", 
    "Moq": "4.2.1510.2205", 
    "Serilog.Framework.Logging": "1.0.0-rc1-final-10071", 
    "Microsoft.AspNet.WebApi.Client": "5.2.3", 
    "Microsoft.Net.Http.Server": "1.0.0-rc1-final", 
    "StructureMap.Dnx": "0.4.0-alpha4" 
    }, 
    "commands": { 
    "web": "Microsoft.AspNet.Server.Kestrel" 
    }, 
    "frameworks": { 
    "dnx451": { 
     "dependencies": { 
     "CMS.Services.Contracts": "1.0.0-*", 
     "CSharpSDK": "1.0.0-*", 
     "Lookups.Contracts": "1.0.0-*", 
     "Services.Internal.Contracts": "1.0.0-*" 
     }, 
     "frameworkAssemblies": { 
     "System.ServiceModel": "4.0.0.0", 
     "System.DirectoryServices.AccountManagement": "4.0.0.0" 
     } 
    } 
    }, 
    "exclude": [ 
    "wwwroot", 
    "node_modules", 
    "bower_components" 
    ], 
    "publishExclude": [ 
    "node_modules", 
    "bower_components", 
    "**.xproj", 
    "**.user", 
    "**.vspscc" 
    ] 
}

我已经添加了其他无数的包，并试图旧版本的人，没有运气：