将现有项目加载到Visual Studio 2013中，获取命名空间错误

Question

我刚刚将Visual Studio 2013安装到我的计算机上。我有Visual Studio 2010.现在我正在尝试将现有的VS2010项目加载到2013.当我构建它时，我得到4个命名空间错误。错误说：

The type or namespace name 'WebPages' does not exist in the namespace 'Microsoft.Web' (are you missing an assembly reference?)
The type or namespace name 'DotNetOpenAuth' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'WebPages' does not exist in the namespace 'Microsoft.Web' (are you missing an assembly reference?)
The type or namespace name 'HttpConfiguration' could not be found (are you missing a using directive or an assembly reference?)

有谁知道为什么我会收到这些错误？当我在页面顶部键入using Microsoft.Web.WebPages.OAuth;时，Intellisense会发现包很好。