Simple question really, I create users programatically and it goes fine. I can add users, EPiServerProfile properties and all roles except "Administrators". When adding it I get this error -> 

Provider Exception Caught
The role 'Administrators' was not found.

I get it after having checked if the role exists and after that adding it with ->

 Roles.AddUserToRole(userName, role);

I don't need to add the users to this group, I'm just curios.