Whenever I add a role to a user on a portal (DNN4.8.2. and then 4.8.3), I get the following error message.   When I click 'add to role' again, the role is listed for the user and (apparently) functional.

Error: is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: String reference not set to an instance of a String. Parameter name: name ---> System.ArgumentNullException: String reference not set to an instance of a String. Parameter name: name at System.Globalization.CultureInfo..ctor(String name, Boolean useUserOverride) at DotNetNuke.Security.Roles.RoleController.SendNotification(UserInfo objUser, RoleInfo objRole, PortalSettings PortalSettings, String Action) at DotNetNuke.Security.Roles.RoleController.AddUserRole(UserInfo objUser, RoleInfo objRole, PortalSettings PortalSettings, DateTime effDate, DateTime expDate, Int32 userId, Boolean notifyUser) at DotNetNuke.Modules.Admin.Security.SecurityRoles.cmdAdd_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---

I've been having issues with users getting logged off repeatedly, and I'm not sure if this has anything to do with this or something else.   Anyone have any ideas?
Thanks.
Jill

I get this as well though I don't have to add the user a second time - user is added to role despite the error displayed, if I just ignore it and move on.

Mostly just using AD authentication.  DNN 4.8.2 at the moment and DNN security is enabled but I'm the only DNN user.

.NET CLR 3.5.21022)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 8ecf2cef-0bf2-44d9-8b0f-bf27d87271b5
InnerException: String reference not set to an instance of a String. Parameter name: name
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Globalization.CultureInfo..ctor
StackTrace:
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: String reference not set to an instance of a String. Parameter name: name ---> System.ArgumentNullException: String reference not set to an instance of a String. Parameter name: name at System.Globalization.CultureInfo..ctor(String name, Boolean useUserOverride) at DotNetNuke.Security.Roles.RoleController.SendNotification(UserInfo objUser, RoleInfo objRole, PortalSettings PortalSettings, String Action) at DotNetNuke.Security.Roles.RoleController.AddUserRole(UserInfo objUser, RoleInfo objRole, PortalSettings PortalSettings, DateTime effDate, DateTime expDate, Int32 userId, Boolean notifyUser) at DotNetNuke.Modules.Admin.Security.SecurityRoles.cmdAdd_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---

Yes it is Brandon and it's fixed in the next release of the AD Provider which is in the Release Tracker right now.