Internal Error: Sub-system: RTM, File: /quartus/tsm/rtm/rtm_min_cost_flow_retimer.cpp, Line: 3097 Cost-scaling is not supported yet. - Internal Error: Sub-system: RTM, File: /quartus/tsm/rtm/rtm_min_cost_flow_retimer.cpp, Line: 3097 Cost-scaling is not supported yet. Description Due to a problem in the Quartus® Prime Pro Edition Software version 26.1 and earlier, you may see the this internal error during the Fitter stage. Resolution To work around this problem, disable the Early Retimer by adding this QSF assignment: set_global_assignment -name FITTER_EARLY_RETIMING OFF This problem is scheduled to be fixed in a future version of the Quartus® Prime Pro Edition Software. Custom Fields values: Troubleshooting QS-52173 novalue ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 26.1 ['Agilex® 3 FPGAs and SoCs', 'Agilex® 5 FPGAs and SoCs', 'Agilex® 7 FPGAs and SoCs', 'Agilex® 9 FPGAs and SoCs', 'Arria® 10 FPGAs and SoCs', 'Cyclone® 10 GX FPGA', 'Stratix® 10 FPGAs and SoCs']