MVC“添加控制器”是“无法检索元数据……配置系统初始化失败”

From scratch, I made a new solution with two projects: one was MVC 3 and the other a supporting EF 4.2 project. The whole thing builds successfully. From the MVC project I open the "Add Controller" dialogue and have it generate code based on the context and model I select from the supporting EF project. The "add controller" dialogue fails with the message:From scratch, I made a new solution with two pr