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无法添加对'System.Net.Http'的引用.请确保它在全局程序集缓存中

我正在尝试将Microsoft.AspNet.WebApiNuget包添加到C#类库项目中.这是项目源代码,以备您需要时使用.

当我在Visual Studio 2013中的Nuget包管理器控制台中执行以下命令时(其中包含最新的.NET 4.5)

PM> install-package Microsoft.AspNet.WebApi ErrandBoy.Web.Common
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我得到以下错误.

PM> install-package Microsoft.AspNet.WebApi ErrandBoy.Web.Common
Attempting to resolve dependency 'Microsoft.AspNet.WebApi.WebHost (? 5.2.2 && < 5.3.0)'.
Attempting to resolve dependency 'Microsoft.AspNet.WebApi.Core (? 5.2.2 && < 5.3.0)'.
Attempting to resolve dependency 'Microsoft.AspNet.WebApi.Client (? 5.2.2)'.
Attempting to resolve dependency 'Newtonsoft.Json (? 6.0.4)'.
'Microsoft.AspNet.WebApi 5.2.2' already installed.
Adding 'Newtonsoft.Json 6.0.4' to ErrandBoy.Web.Common.
Successfully added 'Newtonsoft.Json 6.0.4' to ErrandBoy.Web.Common.
Adding 'Microsoft.AspNet.WebApi.Client 5.2.2' to ErrandBoy.Web.Common.
install-package : Failed to add reference to 'System.Net.Http'. …
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c# nuget asp.net-web-api

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