ID:176098 Can't place differential I/O pin <name>

CAUSE: The Fitter tried to place the specified differential I/O pin. However, the Fitter cannot place the differential I/O pin due to device constraints. This message is a submessage of the message that precedes it in the Messages window and in the Messages section of the Report window.

ACTION: Assign the specified differential I/O pin to a different location.