ID:169079 Pad <number> of non-differential I/O pin '<name>' in pin location <name> is too close to pad <number> of differential I/O pin '<name>' in pin location <name> -- pads must be separated by a minimum of <number> <name>. Use the Pad View of Pin Planner to debug.

CAUSE: You assigned the specified I/O pin with a non-differential I/O standard assignment to the specified pin location in the device that is too close to the specified differential pin in the specified location. Differential and non-differential I/O pins must be separated by the specified amount of device resources.

ACTION: Use the Pad View window of the Pin Planner to check the pad placement, and then assign one of the conflicting I/O pins to a different location.