ID:169077 Can't place pin <name> in VREF group <name> -- VREF group assignment prevents pin from being placed

CAUSE: You made a VREF group assignment for the specified pin. However, the Fitter needs to place the pin in in a location that is not in the specified VREF group. As a result, the Fitter could not place the pin.

ACTION: Remove or modify the VREF group assignment for the pin so that the Fitter can place the pin.