MVC 连接数据库问题

MVC Music store练习中，按照书中操作，但是在添加控制器Store Manager过程中出现了如下错误：

Unable to retreive metadata for 'MvcMovie.Models.Movie'. Using the same DbCompiledModel to create contexts against different types of database servers is not supported. Instead, create a separate DbCompiledModel for each type of server being used

解决方法是Connectstring默认就好了。。。