I created a new DAC and a new related graph.
I tried adding a screen for that DAC/Graph.
I went to Screens->Create Screen. A create screen form was presented.
I provided the requested details, including the graph name.
When I click on Create, the graph name field is cleared and is marked as an error that reads, "The graph already exists."
I assume that this is a noobie’s error, so I would appreciate the guidance of the colleagues in this group.