初始迁移后，EF6中的update-database命令不起作用

我被卡在command:

update-database

而通过Tom Dysktra的教程

下面是我得到的错误:

    PM> update-database
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
No pending explicit migrations.
Running Seed method.
System.Data.Entity.Core.EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details. ---> System.Data.SqlClient.SqlException: Invalid column name 'EmailAddress'.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)

…

    at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
An error occurred while executing the command definition. See the inner exception for details.