VS 2015 will not compile - "Dependence cannot be resolved"

Question

I built an ASP.NET MVC application using Visual Studio RC and now uninstalled this tool and installed RTM for Visual Studio 2015. Each time I try to create an application web.appthrough Ctrl-F5, it throws this error:

EntityFramework> = 7.0.0-beta4 dependency cannot be resolved by web.app

When I double-click on an error, it opens the project.json file.

{
    /* Click to learn more about project.json  http://go.microsoft.com/fwlink/?LinkID=517074 */
    "webroot": "wwwroot",
    "userSecretsId": "***************************************",
    "version": "1.0.0-*",

    "dependencies": {
        "EntityFramework.SqlServer": "7.0.0-beta4",
        "EntityFramework.Commands": "7.0.0-beta4",
        "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta4",
        "Microsoft.AspNet.Authentication.Cookies": "1.0.0-beta4",
        "Microsoft.AspNet.Authentication.Facebook": "1.0.0-beta4",
        "Microsoft.AspNet.Authentication.Google": "1.0.0-beta4",
        "Microsoft.AspNet.Authentication.MicrosoftAccount": "1.0.0-beta4",
        "Microsoft.AspNet.Authentication.Twitter": "1.0.0-beta4",
        "Microsoft.AspNet.Diagnostics": "1.0.0-beta4",
        "Microsoft.AspNet.Diagnostics.Entity": "7.0.0-beta4",
        "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-beta4",
        "Microsoft.AspNet.Server.IIS": "1.0.0-beta4",
        "Microsoft.AspNet.Server.WebListener": "1.0.0-beta4",
        "Microsoft.AspNet.StaticFiles": "1.0.0-beta4",
        "Microsoft.AspNet.Tooling.Razor": "1.0.0-beta4",
        "Microsoft.Framework.ConfigurationModel.Json": "1.0.0-beta4",
        "Microsoft.Framework.ConfigurationModel.UserSecrets": "1.0.0-beta4",
        "Microsoft.Framework.CodeGenerators.Mvc": "1.0.0-beta4",
        "Microsoft.Framework.Logging": "1.0.0-beta4",
        "Microsoft.Framework.Logging.Console": "1.0.0-beta4",
        "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta4",
        "Microsoft.AspNet.Mvc": "6.0.0-beta4",
        "Microsoft.Net.Http.Server": "1.0.0-beta4"
    },

    "commands": {
        "web": "Microsoft.AspNet.Hosting --server Microsoft.AspNet.Server.WebListener --server.urls http://localhost:5000",
        "gen": "Microsoft.Framework.CodeGeneration",
        "ef": "EntityFramework.Commands"
    },

    "frameworks": {
        "dnx451": {
            "frameworkAssemblies": {
                "System.Net": "4.0.0.0",
                "System.Web": "4.0.0.0",
                "System.Web.Extensions": "4.0.0.0"
            }
        }
    },

    "exclude": [
        "wwwroot",
        "node_modules",
        "bower_components"
    ],

    "publishExclude": [
        "node_modules",
        "bower_components",
        "**.xproj",
        "**.user",
        "**.vspscc"
    ],

    "scripts": {
        "postrestore": [ "npm install", "bower install" ],
        "prepare": [ "grunt bower:install" ]
    }
}

I upgraded PowerShell to 4.0 and then upgraded my DNX with this command:

PM> Install-Package EntityFramework.SqlServer -Pre

which installed EntityFramework.SqlServer 7.0.0-beta5. No difference in error. I'm losing my mind and need to actually do some work with Visual Studio. Has anyone got any answers?

RTM RC, , Visual Studio. , RC.