有没有人知道为什么我收到以下错误消息？
我正在尝试使用最新版本的用于Cordova的Apache Tools（7）构建一个空白项目。之前一切正常（直到版本6）。
看起来它与Visual Studio无法安装“vs-tac”模块有关，因为nuget有些失败，尽管我发现它很奇怪。我也尝试重新安装它，卸载并安装以前的版本，但没有任何对我有用，因为同样的原因失败。
谢谢！
1>------ Build started: Project: BlankCordovaApp2, Configuration: Debug Android ------
1> Your environment has been set up for using Node.js 0.12.2 (x64) and npm.
1> ------ Ensuring correct global installation of package from source package directory: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO 14.0\COMMON7\IDE\EXTENSIONS\APACHECORDOVATOOLS\packages\vs-tac
1> ------ Name from source package.json: vs-tac
1> ------ Version from source package.json: 1.0.37
1> ------ Package not currently installed globally.
1> ------ Installing globally from source package. This could take a few minutes...
1> Each package is licensed to you by its owner. Microsoft is not responsible for, nor does it grant any licenses to, third-party packages. Some packages may include dependencies which are governed by additional licenses. Follow the package source (feed) URL to determine any dependencies.
1> npm WARN deprecated graceful-fs@3.0.8: graceful-fs version 3 and before will fail on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possible.
1> > edge-cs@0.3.0 install C:\Users\grighetti\AppData\Roaming\npm\node_modules\vs-tac\node_modules\edge\node_modules\edge-cs
1> > node tools/install.js
1> Microsoft .NET Development Utility CLR-x86-1.0.0-beta6-12256
1> Restoring packages for C:\Users\grighetti\AppData\Roaming\npm\node_modules\vs-tac\node_modules\edge\node_modules\edge-cs\lib\edge-cs-coreclr\project.json
1> CACHE https://www.nuget.org/api/v2/
1> GET https://www.nuget.org/api/v2/FindPackagesById()?id='Microsoft.CodeAnalysis.CSharp'
1>RUNMDAINSTALL : warning : FindPackagesById: Microsoft.CodeAnalysis.CSharp
1> Response status code does not indicate success: 401 (Unauthorized).
1> GET
1> GET https://www.nuget.org/api/v2/FindPackagesById()?id='System.Text.RegularExpressions'
1>RUNMDAINSTALL : warning : FindPackagesById: Microsoft.CodeAnalysis.CSharp
1> Response status code does not indicate success: 401 (Unauthorized).
其他类似的错误消息，然后
1> ----------
1> System.Net.Http.HttpRequestException: Response status code does not indicate success: 401 (Unauthorized).
1> at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
1> at Microsoft.Framework.PackageManager.Restore.NuGet.HttpSource.<GetAsync>d__8.MoveNext()
1> ----------
1> Restore failed
1> Response status code does not indicate success: 401 (Unauthorized).
1> NuGet Config files used:
1> C:\Users\grighetti\AppData\Roaming\NuGet\NuGet.Config
1> Feeds used:
1> https://www.nuget.org/api/v2/