ID:15722 Virtual pin clock "<name>" for virtual pin "<name>" does not exist in the design -- auto-selecting clock

CAUSE: You assigned the Virtual Pin Clock logic option to the specified clock signal (node). However this clock signal does not exist in the current design. When this condition occurs, Analysis & Synthesis automatically selects an appropriate virtual pin clock.

ACTION: No action is required. To avoid receiving this message in the future, assign the Virtual Pin Clock assignment to an existing clock signal in the design.