Internal Error: Sub-system: VPR20KMAIN, File: /quartus/fitter/vpr20k/vpr_common/route_node_reservations.c, Line: 327

Description

Due to a problem in the Quartus® II software version 12.0 and later, you may see this internal error during fitting. The problem occurs when you have set the allow multiple personas option on unsupported device families.

Resolution

To avoid this problem, do not set the allow multiple personas option when compiling for an unsupported device family.