Today I've noticed a problem with my site that has occurred after the latest upgrade.

A user can go through the normal process of registering and all the functionality of the register page works, however, once the user clicks register they are given an error message, "An error has occurred. Error: is currently unavailable."

When I log in as an admin, the user has been added, but no verification emails get sent, therefore the user stays unauthorized.  I can manually authorize the user and the user profile functions normally.

Upon checking the log, this is the copy of the module exception error that is thrown

ModuleId:-1

ModuleDefId:-1

FriendlyName:

ModuleControlSource:DesktopModules/Admin/Security/Register.ascx

AssemblyVersion:7.2.2

PortalID:0

PortalName:mySite

UserID:-1

UserName:

ActiveTabID:56

ActiveTabName:Home

RawURL:/register.aspx?returnurl=http%253a%252f%252fwww.mysite.com%252fHome.aspx&popUp=true

AbsoluteURL:/Default.aspx

AbsoluteURLReferrer:http://www.mysite.com/register.aspx?returnurl=http%253a%252f%252fwww.mysite.com%252fHome.aspx&popUp=true

UserAgent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:a05cebad-9759-44e7-9d99-0febe8a40e8e

InnerException:Object reference not set to an instance of an object.

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:DotNetNuke.Entities.Users.UserInfo.GetProperty

StackTrace:

Message:

DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> 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.Mail.Mail.SendMail(UserInfo unser, MessageType msgType, PortalSettings settings)
   at DotNetNuke.Entities.Modules.UserModuleBase.CompleteUserCreation(UserCreateStatus createStatus, UserInfo newUser, Boolean notify, Boolean register)
   at DotNetNuke.Modules.Admin.Users.Register.CreateUser()
   --- End of inner exception stack trace ---

Any help greatly appreciated.

Thanks

I checked the user profile, First Name, Last Name are the only required fields, everything was filled in including UserName

I checked the users table, each record appears to be the same.

I had seen an article with similar problems that referenced the type of  user registration.... this error occurs using the verified type, if it's set public there is no error.

I guess I'm not sure how I would track down what would be causing that?