Internal Error: Sub-system: FDRGN, File: /quartus/fitter/fdrgn/fdrgn_spar_slack_alloc.cpp, Line: 1460 - Internal Error: Sub-system: FDRGN, File: /quartus/fitter/fdrgn/fdrgn_spar_slack_alloc.cpp, Line: 1460 Description Due to a problem in the Intel® Quartus® Prime Pro Edition Software version 22.4 and earlier, you might see this internal error during fitter Finalize stage. Resolution A patch is available to fix this problem for the Intel® Quartus® Prime Pro Edition Software version 22.2. Download and install Patch 0.44 from the following links: Intel® Quartus® Prime Pro Edition Software v22.2 Patch 0.44 for Windows (.exe) Intel® Quartus® Prime Pro Edition Software v22.2 Patch 0.44 for Linux (.run) Readme for Intel® Quartus® Prime Pro Edition Software v22.2 Patch 0.44 (.txt) This problem is fixed starting with the Intel® Quartus® Prime Pro Edition Software version 23.1. Custom Fields values: ['novalue'] Troubleshooting 15012418168 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 23.1 22.4 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']