ASP.Net MVC脚手架问题

Question

我正在尝试使用下表的脚手架模板创建ASP.Net MVC CRUD

CREATE TABLE [dbo].[tblCont]
(
    [ContId] [int] NOT NULL,
    [ContName] [varchar](50) NULL,
    [ContType] [varchar](50) NULL,

    CONSTRAINT [PK_tblCont] 
        PRIMARY KEY CLUSTERED ([ContId] ASC)
)
GO

CREATE TABLE [dbo].[tblMaster]
(
    [CovId] [int] NOT NULL,
    [CovName] [varchar](50) NOT NULL,
    [VendId] [int] NOT NULL,
    [ContId] [int] NOT NULL,
    [PcId] [int] NOT NULL,
    [PrdId] [int] NOT NULL,

    CONSTRAINT [PK_tblMaster] 
        PRIMARY KEY CLUSTERED ([CovId] ASC)
)
GO

CREATE TABLE [dbo].[tblPc]
(
    [PcId] [int] NOT NULL,
    [PcCode] [int] NULL,
    [Area] [nchar](10) NULL,
    [District] [nchar](10) NULL,

    CONSTRAINT [PK_tblPc] 
        PRIMARY KEY CLUSTERED ([PcId] ASC)
)
GO

CREATE TABLE [dbo].[tblPrd]
(
    [PrdId] [int] NOT NULL,
    [LobCode] [int] NULL,
    [PrdDesc] [nchar](10) NULL,
    [PrdLang] [nchar](10) NULL,

    CONSTRAINT [PK_tblPrd] 
        PRIMARY KEY CLUSTERED ([PrdId] ASC)
)
GO

CREATE TABLE [dbo].[tblVend]
(
    [VendId] [int] NOT NULL,
    [VendName] [nchar](10) NULL,

    CONSTRAINT [PK_tblVend] 
        PRIMARY KEY CLUSTERED ([VendId] ASC)
)
GO

使用ADO.Net实体模型我已经在模型浏览器中添加了所有表，但是在构建时出现了图像中的错误

我做错了什么吗，或者使用ASP.NET MVC脚手架是不可能的？请指教