I did some investigating and I changed the access db in two places
1. in table: CuteChat4_SuupportAgent
Changed DepartmentID - took off Primary Key and allowed duplicates.
That only makes sense for this column has duplicates.
2. In Table: SampleUsers
Change Email field to be NOT required. Since you do not have that field in the Manage Operators page, adding the first operator works fine, but when adding a second it errors out because it is trying to insert a "blank" email which is a duplicate and not accepted.
Scott