ID:169290 Can't place differential I/O <name> pin <name> at a differential I/O <name> location <name>(<name>)

CAUSE: You assigned the specified differential I/O pin at the specified I/O location in the device. However, the Fitter cannot place the pin at the location because they have different polarities.

ACTION: Delete or change the location assignment, or change the I/O standard assignment.