添加依賴項和更新模型類後，使用EF 7運行應用程序時出錯

我正在運行MVC 6和EF 7並且已經更改了我的模型並希望運行應用程序，但是我收到錯誤並且不清楚根本原因是什麼。

下面是我的project.json的片段

"dependencies": {
"EntityFramework.Commands": "7.0.0-beta5",
"EntityFramework.SqlServer": "7.0.0-beta5",
"Microsoft.AspNet.Antiforgery": "1.0.0-beta6",
"Microsoft.AspNet.Authentication.Cookies": "1.0.0-beta5",
"Microsoft.AspNet.Authentication.Facebook": "1.0.0-beta5",
"Microsoft.AspNet.Authentication.Google": "1.0.0-beta5",
"Microsoft.AspNet.Authentication.MicrosoftAccount": "1.0.0-beta5",
"Microsoft.AspNet.Authentication.Twitter": "1.0.0-beta5",
"Microsoft.AspNet.Diagnostics": "1.0.0-beta5",
"Microsoft.AspNet.Diagnostics.Entity": "7.0.0-beta5",
"Microsoft.AspNet.Identity.EntityFramework": "3.0.0-beta5",
"Microsoft.AspNet.Mvc": "6.0.0-beta5",
"Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta5",
"Microsoft.AspNet.Server.IIS": "1.0.0-beta5",
"Microsoft.AspNet.Server.WebListener": "1.0.0-beta5",
"Microsoft.AspNet.Session": "1.0.0-beta6",
"Microsoft.AspNet.StaticFiles": "1.0.0-beta5",
"Microsoft.AspNet.Tooling.Razor": "1.0.0-beta5",
"Microsoft.Framework.Configuration.Abstractions": "1.0.0-beta5",
"Microsoft.Framework.Configuration.Json": "1.0.0-beta5",
"Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta5",
"Microsoft.Framework.Logging": "1.0.0-beta5",
"Microsoft.Framework.Logging.Console": "1.0.0-beta5",
"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta5"
},

以下是網頁錯誤。

System.MissingMethodException未找到方法：'Boolean Microsoft.Framework.DependencyInjection.ServiceCollectionExtensions.TryAdd（Microsoft.Framework.DependencyInjection.IServiceCollection，Microsoft.Framework.DependencyInjection.ServiceDescriptor）。 Microsoft.AspNet.Loader.IIS.RuntimeHttpApplication.ApplicationStart上的Microsoft.AspNet.Hosting.WebHostBuilder.Build（）中的Microsoft.AspNet.Hosting.WebHostBuilder.BuildHostingServices（）上的Microsoft.Framework.DependencyInjection.LoggingServiceCollectionExtensions.AddLogging（IServiceCollection services） （IHttpApplication應用程序）在Microsoft.AspNet.Loader.IIS.HttpApplicationBase.InvokeApplicationStart（IHttpApplication應用程序）