FileMaker won't let you set up relationships where the path from table occurrence to table occurrence forms a circular path.
You'll need separate occurrences of Employee of at least one of the two relationships
These relationships should work:
EmployeesbyID 1----<FeedBack>-----EmployeesByName------<Projects>-------EmployeesByID 2
On the other hand separate sets of occurrences all around might better serve keeping your relationship graph in order in terms of the Anchor Buoy method: