for some reason the role controller's addrole procedure is returning -1. what am i doing wrong here?

Thanks in advance, here's the code:      

        Dim rc As New DotNetNuke.Security.Roles.RoleController
        Dim ri As New DotNetNuke.Security.Roles.RoleInfo
        Dim i As Integer

        ri = rc.GetRoleByName(0, "CustomerContacts")
        If ri Is Nothing Then
            ri = New DotNetNuke.Security.Roles.RoleInfo
            log.AppendLine("CustomerContacts role does not exist, adding...")
            ri.RoleName = "CustomerContacts"
            ri.Description = "Customer contacts for Baytek International"
            ri.PortalID = 0
            ri.IsPublic = False
            ri.AutoAssignment = False
            ri.ServiceFee = "0.0"
            ri.BillingPeriod = 6
            ri.BillingFrequency = "Month"
            'ri.TrialFee = 0.0
            'ri.TrialPeriod = 0
            'ri.TrialFrequency = Nothing
            i = rc.AddRole(ri)
        Else
            log.AppendLine("CustomerContacts role exists, skipping...")
        End If

after some more digging i found that there was an exception.

hit a foreign key constraint on rolegroupID

setting the rolegroupid to -1 fixed the problem.

I wonder why no one else had this problem?