"Il file di blocco previsto non esiste. Esegui" dnu restore "" subito dopo averlo fatto

Sono in esecuzione beta7 per tutto, incluso EF 7. Sto provando a collegarmi al mio database remoto remoto usando il progetto del modello di applicazione ASP.NET 5. Il mio project.json ha questo aspetto:

{
  "webroot": "wwwroot",
  "userSecretsId": "aspnet5-XXX-409e9e37-b7bb-4185-b7aa-6dc336087524",
  "version": "1.0.0-*",

  "dependencies": {
    "EntityFramework.Commands": "7.0.0-beta7",
    "EntityFramework.SqlServer": "7.0.0-beta7",
    "Microsoft.AspNet.Authentication.Cookies": "1.0.0-beta7",
    "Microsoft.AspNet.Authentication.Facebook": "1.0.0-beta7",
    "Microsoft.AspNet.Authentication.Google": "1.0.0-beta7",
    "Microsoft.AspNet.Authentication.MicrosoftAccount": "1.0.0-beta7",
    "Microsoft.AspNet.Authentication.Twitter": "1.0.0-beta7",
    "Microsoft.AspNet.Diagnostics": "1.0.0-beta7",
    "Microsoft.AspNet.Diagnostics.Entity": "7.0.0-beta7",
    "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-beta7",
    "Microsoft.AspNet.Mvc": "6.0.0-beta7",
    "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta7",
    "Microsoft.AspNet.Server.IIS": "1.0.0-beta7",
    "Microsoft.AspNet.Server.WebListener": "1.0.0-beta7",
    "Microsoft.AspNet.StaticFiles": "1.0.0-beta7",
    "Microsoft.AspNet.Tooling.Razor": "1.0.0-beta7",
    "Microsoft.Framework.Configuration.Abstractions": "1.0.0-beta7",
    "Microsoft.Framework.Configuration.Json": "1.0.0-beta7",
    "Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta7",
    "Microsoft.Framework.Logging": "1.0.0-beta7",
    "Microsoft.Framework.Logging.Console": "1.0.0-beta7",
    "Microsoft.Framework.Logging.Debug" : "1.0.0-beta7",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta7"
  },

  "commands": {
    "web": "Microsoft.AspNet.Hosting --config hosting.ini",
    "ef": "EntityFramework.Commands"
  },

  "frameworks": {
    "dnx451": { },
    "dnxcore50": { }
  },

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

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

  "scripts": {
   "prepublish": [ "npm install", "bower install", "gulp clean", "gulp min" ]
  }
}

Facendo una ricerca online sembrava che per realizzare ciò che volevo avevo bisogno di eseguire il seguente comando:

dnx ef dbcontext scaffold "ConnectionString" EntityFramework.SqlServer

Quale non potrei fare perché ho avuto un problema che è stato risolto come spiegato qui: Utilizzo del database esistente con ASP.NET 5 e EF7 (beta 7)

Ora posso finalmente eseguire il comando "dnx", ma quando provo a eseguirlo con il mio connectiontring, che assomiglia a questo:

dnx ef dbcontext scaffold "Data Source=192.168.XX.XXX\devsql;Initial
Catalog=Development;Integrated Security=False;User ID=system;Password=XXX;"
EntityFramework.SqlServer

mi dà i seguenti errori:

[ERROR] dnx : System.InvalidOperationException: Failed to resolve the
following dependencies for target framework 'DNXCore,Version=v5.0':
[ERROR] En línea: 1 Carácter: 1 [ERROR] + dnx ef dbcontext scaffold
"Data Source=192.168.XX.XXX\devsql;Initial Catalog=Dev ... [ERROR] +
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ERROR]     + CategoryInfo          : NotSpecified:
(System.InvalidO...,Version=v5.0'::String) [], RemoteException [ERROR]
+ FullyQualifiedErrorId : NativeCommandError [ERROR]   [ERROR]    EntityFramework.Commands 7.0.0-beta7 [ERROR]   
EntityFramework.SqlServer 7.0.0-beta7 [ERROR]   
Microsoft.AspNet.Authentication.Cookies 1.0.0 [ERROR] -beta7 [ERROR]  
Microsoft.AspNet.Authentication.Facebook 1.0.0-beta7 [ERROR]   
Microsoft.AspNet.Authentication.Google 1.0.0-beta7 [ERROR]   
Microsoft.AspNet.Authentication.MicrosoftAccount 1.0.0-beta7 [ERROR]  
Microsoft.AspNet.Authentication.Twitter 1.0.0-beta7 [ERROR]   
Microsoft.AspNet.Diagnostics 1.0.0-beta7 [ERROR]   
Microsoft.AspNet.Diagnostics.Entity 7.0.0-beta7 [ERROR]   
Microsoft.AspNet.Identity.EntityFramework 3.0.0-beta7 [ERROR]   
Microsoft.AspNet.Mvc 6.0.0-beta7 [ERROR]   
Microsoft.AspNet.Mvc.TagHelpers 6.0.0-beta7 [ERROR]   
Microsoft.AspNet.Server.IIS 1.0.0-beta7 [ERROR]   
Microsoft.AspNet.Server.WebListener 1.0.0-beta7 [ERROR]   
Microsoft.AspNet.StaticFiles 1.0.0-beta7 [ERROR]   
Microsoft.AspNet.Tooling.Razor 1.0.0-beta7 [ERROR]   
Microsoft.Framework.Configuration.Abstractions 1.0.0-beta7 [ERROR]   
Microsoft.Framework.Configuration.Json 1.0.0-beta7 [ERROR]   
Microsoft.Framework.Configuration.UserSecrets 1.0.0-beta7 [ERROR]   
Microsoft.Framework.Logging 1.0.0-beta7 [ERROR]   
Microsoft.Framework.Logging.Console 1.0.0-beta7 [ERROR]   
Microsoft.Framework.Logging.Debug 1.0.0-beta7 [ERROR]   
Microsoft.VisualStudio.Web.BrowserLink.Loader 14.0.0-beta7 [ERROR] 
[ERROR]
C:\XXX\XXX\src\XXX\project.lock.json(1,0):
error: The expected lock file doesn't exist. Please run "dnu restore"
to generate a new lock file. [ERROR] Current runtime target framework:
'DNXCore,Version=v5.0 (dnxcore50)' [ERROR]  Version:     
1.0.0-beta7-15532 [ERROR]  Type:         CoreCLR [ERROR]  Architecture: x64 [ERROR]  OS Name:      Windows [ERROR]  OS Version: 
6.1 [ERROR]  [ERROR]    at Microsoft.Dnx.Runtime.DefaultHost.GetEntryPoint(String
applicationName) [ERROR]    at
Microsoft.Dnx.ApplicationHost.Program.ExecuteMain(DefaultHost host,
String applicationName, String[] args) [ERROR]    at
Microsoft.Dnx.ApplicationHost.Program.Main(String[] args) [ERROR] ---
End of stack trace from previous location where exception was thrown
--- [ERROR]    at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() [ERROR]
at Microsoft.Dnx.Runtime.Common.EntryPointExecutor.Execute(Assembly
assembly, String[] args, IServiceProvider serviceProvider) [ERROR]   
at Microsoft.Dnx.Host.Bootstrapper.RunAsync(List`1 args,
IRuntimeEnvironment env, FrameworkName targetFramework) [ERROR]    at
Microsoft.Dnx.Host.RuntimeBootstrapper.ExecuteAsync(String[] args,
FrameworkName targetFramework) [ERROR]    at
Microsoft.Dnx.Host.RuntimeBootstrapper.Execute(String[] args,
FrameworkName targetFramework) [ERROR]

dato che

[ERROR]
C:\XXX\XXX\src\XXX\project.lock.json(1,0):
error: The expected lock file doesn't exist. Please run "dnu restore"
to generate a new lock file.

Ho provato a correre

PS C:\XXX\XXX> dnu restore
Microsoft .NET Development Utility CoreCLR-x64-1.0.0-beta7-15532

CACHE https://api.nuget.org/v3/index.json Restoring packages for
C:\XXX\XXX\src\XXX\project.json   CACHE
https://api.nuget.org/v3-flatcontainer/system.threading.threadpool/index.json
GET
https://api.nuget.org/v3-flatcontainer/system.net.sockets/index.json  
OK
https://api.nuget.org/v3-flatcontainer/system.net.sockets/index.json
1117ms Writing lock file
C:\XXX\XXX\src\XXX\project.lock.json Restore
complete, 2071ms elapsed

NuGet Config files used:
    C:\Users\XXX\AppData\Roaming\NuGet\NuGet.Config
    C:\XXX\XXX\NuGet.Config

Feeds used:
    https://api.nuget.org/v3-flatcontainer/

Il che ricrea il project.lock.json con successo, a quanto pare (timestamp riflette anche questo). Tuttavia, quando provo di nuovo a eseguire lo script scaffold, continua a mostrare lo stesso errore mostrato sopra, inclusa la parte "il file di blocco previsto non esiste".

Qualche idea di cosa sta andando storto?