ID:186087 Differential I/O "<name>" pin "<name>" is assigned to a <name> location <name>. However, it must be assigned to a differential <name> location

CAUSE: You assigned the specified differential I/O pin to the specified location in the device. However, the Fitter cannot place the pin at the location because the direction of the pin does not match that of the location. The pin must be assigned to the specified differential location.

ACTION: Remove or change the pin assignment.