本人弄了一个虚拟机做了MVC４的网站，带数据库发布的时候可以正常浏览，但是。在登录的时候出错了
报错如下：
Invalid value for key 'attachdbfilename'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Invalid value for key 'attachdbfilename'.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
不知道是那里出错了 ，请问大神
