Internal Error: Sub-system: CPT, File: /quartus/sys/cpt/cptc/cpt_ampp.c, Line: 5467 output_index < CPT_AMPP_MAX_SOURCES - Internal Error: Sub-system: CPT, File: /quartus/sys/cpt/cptc/cpt_ampp.c, Line: 5467 output_index < CPT_AMPP_MAX_SOURCES Description Due to problem in the Quartus® Prime Pro Edition Software version 18.1 and earlier, you may see this internal error when running each of the fitter phases separately in a design with more than 250 encrypted IPs. Resolution To work around this problem run the fitter phases in a single step with the following command: quartus_fit <design name> Custom Fields values: ['novalue'] Troubleshooting 2205829827 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] No plan to fix 18.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']