I created a new sub-task issue type called "Design Bug". When I try to create and save a new design bug, it fails to save and I receive an error saying "An Epic Link is required to create a Story, Bug or Task" (which implies it is registering the issue type as a Story, Bug, or Task). To resolve this issue, I tried adding Epic Link to the design bug screen & field configuration, but then I receive an error saying "A subtask cannot be assigned to an epic"(see image attached for reference of both error messages)
I have tried to retrace steps and remove Epic Link from the design bug screen & design bug field configuration, but that did not help. The design bug screen is definitely included in my issue type screen scheme.
Does anyone know why it is processing the issue type incorrectly? 