Code First 无法创建表，如何处理

Question

项目中使用Package Manager Console加载EFCodeFirst1.1；

创建类

 public partial class BlogUser {
        /// <summary>       
        /// 默认情况下属性被命名为ID、id或者[ClassName]Id，将映射为数据表中的主键       
        /// 如果没有类似的命名，并且也未显示指明主键，则生成失败，引发异常       
        /// </summary>       
        public int BlogUserId { get; set; }
        public string BlogName { get; set; }
        /// <summary>       
        /// 定义博客用户的随笔列表       
        /// virtual表示该列表为延迟加载       
        /// </summary>       
        public virtual ICollection<Post> Posts { get; set; }
    }
    public partial class Post {
        public int PostId { get; set; }
        public string PostTitle { get; set; }
        public int BlogUserId { get; set; }
        /// <summary>       
        /// 延迟加载博客用户       
        /// </summary>       
        public virtual BlogUser BlogUser { get; set; }
    }
    public class BlogDbContext : DbContext {
        public BlogDbContext()
            : base("name=EFDemoDBConnectionString") {
           
        }
        public IDbSet<BlogUser> BlogUsers { get; set; }
        public IDbSet<Post> Posts { get; set; }
    }

使用Database.SetInitializer<BlogDbContext >(new DropCreateDatabaseIfModelChanges<BlogDbContext >());语句无法创建表

错误提示：

Model compatibility cannot be checked because the database does not contain model metadata. Ensure that IncludeMetadataConvention has been added to the DbModelBuilder conventions.

不知哪位专家能给解答下