ID:186077 Can't place Fast PLL "<name>" that drives differential I/Os because its clock input pin "<name>" is placed at location <name>, which does not directly drive a clock input

CAUSE: The Fitter cannot place the specified fast PLL that drives differential I/Os because its specified clock input pin is placed at the specified location, which does not directly drive a clock input.

ACTION: Reassign the specified clock input pin to a dedicated clock pin or delete the assignment.