Description
Due to a problem in the Quartus® II software version 12.0 SP2, you may see this error during the Assembler if your design targets a Stratix® V device.
Resolution
To fix this problem, download and install the Stratix V/Arria® V/Cyclone® V device patch 2.dp5 or later from the related solution below. You must install the Quartus II software version 12.0 SP2 before installing this patch.
This problem is fixed beginning with the Quartus II software version 12.1.