Description
Due to a problem in the Quartus® II software version 14.1 Update 1 and earlier, you may encounter this error when fitting a desing which uses LogicLock regions to constrain logic placement.
The error is due to a problem with the fitting of carry chains implemented in the logic assigned to LogicLock regions.
Resolution
A patch is available for the Quartus II software version 14.1 Update 1.
This problem is scheduled to be fixed in a future release of the Quartus II software.