ID:251015 Can't save incomplete assignment -- error: <text>

CAUSE: You saved assignment edits in the Assignment Editor, but one or more required fields of an assignment are incomplete. The Quartus Prime software cannot save incomplete assignments. Assignments with errors or potential errors appear in dark red by default in the Assignment Editor.

ACTION: Edit the assignments so that all required fields are complete and contain legal settings. Click the + icon to expand this messages in the Messages window to see more details about the assignment errors.