ASP .NET MVC Custom Profile Settings Not Found Issue - asp.net-mvc-3

Question

Currently I am using a custom profile in my ASP .NET MVC application. When creating users and setting the profile properties everything works fine. The issue I am having is that when I edit a user I keep on getting a settings property 'FirstName' was not found error.
Here is the code I am using, and from my understanding it should work fine:
User Profile Class
public class UserProfile : ProfileBase
{
[SettingsAllowAnonymous(false)]
public string FirstName
{
get { return base["FirstName"] as string; }
set { base["FirstName"] = value; }
}
[SettingsAllowAnonymous(false)]
public string LastName
{
get { return base["LastName"] as string; }
set { base["LastName"] = value; }
}
public static UserProfile GetUserProfile()
{
return Create(Membership.GetUser().UserName) as UserProfile;
}
public static UserProfile GetUserProfile(string username)
{
return Create(username) as UserProfile;
}
}
Web.config
<membership>
<providers>
<clear/>
<add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices"
enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false"
maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10"
applicationName="/" />
</providers>
</membership>
<profile inherits="MissionManager.Models.UserProfile">
<providers>
<clear/>
<add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/" />
</providers>
</profile>
Calling Code - Note that before I even hit this method, ASP .NET is running into the error mentioned above.
[HttpPost]
public ActionResult Edit(UserModel model)
{
try
{
MembershipService.UpdateUser(User.Identity.Name, model);
return RedirectToAction("Index");
}
catch
{
return View();
}
}

Answer 1

I have something similar that works. The differences are:
public string FirstName
{
get { return this["FirstName"] as string; }
set { this["FirstName"] = value; }
}
public string LastName
{
get { return this["LastName"] as string; }
set { this["LastName"] = value; }
}
I don't have the attributes on the custom properties and I use this instread of base
HTH