I use an external wcf service that registers users.  I obtain the registration verification code with the code below.  It worked great until I upgraded my dll's to 7.3 -- now I get the NullReferenceException error message below.  Any idea why or if there's an alternate way to get the verification code?  Everything else works fine.

TokenReplace tr = newTokenReplace(Scope.SystemMessages, oUser.Profile.PreferredLocale, currentPortal, oUser);

tr.AccessingUser = newUserController().GetUser(currentPortal.PortalId, currentPortal.AdministratorId);

string verificationCode = tr.ReplaceEnvironmentTokens("[User:VerificationCode]");

Error message:

System.NullReferenceException: Object reference not set to an instance of an object.

at DotNetNuke.Entities.Users.UserInfo.GetProperty(String propertyName, String format, CultureInfo formatProvider, UserInfo accessingUser, Scope currentScope, Boolean& propertyNotFound)

at DotNetNuke.Services.Tokens.BaseCustomTokenReplace.replacedTokenValue(String strObjectName, String strPropertyName, String strFormat)

at DotNetNuke.Services.Tokens.BaseTokenReplace.ReplaceTokens(String strSourceText)

at DotNetNuke.Services.Tokens.TokenReplace.ReplaceTokens(String strSourceText)

at APService.Controller.UserRegistration.RegisterUser() in c:.....UserRegistration.cs:line 87