Internal Error: Sub-system: FPP, File: /quartus/fitter/fpp/fpp_cell.cpp, Line: 703

Description

Due to a problem in the Quartus® II software versions 12.0, you may see this error message if you change a pin location while using incremental compilation.

Resolution

To work around this error, compile the design with all partitions set to Source.

This problem is fixed beginning with the Quartus II software version 12.1.