ID:176290 Can't place <number> pins with I/O standards supported only on horizontal I/O pins -- only <number> horizontal I/O pins available for general purpose I/O placement

CAUSE: You assigned I/O standards which can only be used on horizontal I/O pins to the specified number of pins. However, the Fitter cannot place the pins with these I/O standards because it has only the specified number of free horizontal I/O pins available for general purpose I/O placement.

ACTION: Change the location assignments on the pins assigned to horizontal I/O pin locations or the I/O standard assignments on the pins which need to be placed in horizontal I/O locations.