使用模型优先生成代码时出现实体框架错误

Question

As can be seen in the above image, I've defined an Entity Customer with a primary key Id , a FirstName and a LastName . I saved the model file and tried to build the solution. I got the following build errors:

Im using Entity Framework 5 on Visual Studio 2012. My purpose is to design the model and then have the database code generated. Any idea what might be wrong?

Here is some more info:

EDIT. Even more info:

Answer 1

转到模型浏览器，然后在其中删除重复的属性。