Invalid Column FailedPasswordAnswerAttemptWindowStart

Using Universal Providers in Visual Studio 2012 ASP.NET web application.  I created a method to send an email with a  "reset password" link to a user's email address (in Memberships table) to allow them to reset their password if they had forgotten it.  The email works, the link works, but when the user tries to reset their password, I get an exception "invalid column name FailedPasswordAnswerAttemptWindowStart" even though, the column DOES exist (it was created automatically when I added the Universal Providers) and it is included in the mapping.  The code that produces the error is:

string password = txt_pwd.Text; MembershipUser mu = Membership.GetUser(username); mu.ChangePassword(mu.ResetPassword(), password);

Does anyone know what the problem is here?  Any assistance is greatly appreciated.

Thanks!