SQL Server中出错。无法在aspnetdb文件'aspnet_Membership'中看到表

Question

我在ASP.NET中运行了以下查询：

SELECT     
    Files.ID, Files.FileName, 
    Files.File_Name, Files.CreatingDate, 
    aspnet_Users.UserName, aspnet_Membership.Email 
FROM         
   aspnet_Membership 
INNER JOIN 
   aspnet_Users ON aspnet_Membership.UserId = aspnet_Users.UserId 
INNER JOIN 
   Files ON aspnet_Membership.UserId = Files.UserId

这会触发错误

  

无法在aspnetdb文件'aspnet_Membership'中看到表。

我该如何解决这个问题？