Fatal Error: Access Violation at 0X000007FE721840FD Module: quartus_fit.exe: - Fatal Error: Access Violation at 0X000007FE721840FD Module: quartus_fit.exe: Description Due to a problem in the Intel® Quartus® Prime Standard Edition software version 18.1, 19.1 and 20.1 for Windows* OS, you may see the following error messages during the Fitter stage. Error: *** Fatal Error: Access Violation at 0X00007FFC7DBF4101 Module: quartus_fit.exe Stack Trace: 0x114100: pl_propagate_constraints 0x100 (fitter_vpr20kmain) 0x113576: pl_alloc_and_load_constraints 0xb6 (fitter_vpr20kmain) 0x1017f3: pl_alloc_and_load_placement_optimization_data 0x43 (fitter_vpr20kmain) 0x30f81b: aa_pl_initialize_vpr_placer 0xab (fitter_vpr20kmain) 0x30edd1: aa_try_place 0x71 (fitter_vpr20kmain) 0x26df71: aa_flow_do_placement_attempt 0x21 (fitter_vpr20kmain) 0x26b5a9: aa_flow_place 0x149 (fitter_vpr20kmain) 0x26b16d: aa_flow_fit 0x11d (fitter_vpr20kmain) 0x5735ae: VPR_QI_FACADE::vpr_qi_main 0x6e (fitter_vpr20kmain) 0x3384e: fitapi_run_vpr 0x7e (fitter_fitapi) 0x57488: FITCC_EXPERT::run_vpr 0x138 (FITTER_FITCC) 0x56f55: FITCC_EXPERT::place_and_route 0xf5 (FITTER_FITCC) 0x5641d: FITCC_EXPERT::invoke_fitter 0x69d (FITTER_FITCC) 0x23af6: fygr_execute 0x1a6 (fitter_fygr) 0xe910: fmain_start 0x900 (FITTER_FMAIN) 0x41b1: qfit_execute_fit 0x1bd (comp_qfit_legacy_flow) 0x5384: QFIT_FRAMEWORK::execute 0x2a0 (comp_qfit_legacy_flow) 0x267f: qfit_legacy_flow_run_legacy_fitter_flow 0x1c7 (comp_qfit_legacy_flow) 0x14410: TclInvokeStringCommand 0xf0 (tcl86) 0x161e2: TclNRRunCallbacks 0x62 (tcl86) 0x17a65: TclEvalEx 0xa65 (tcl86) 0xa6f8b: Tcl_FSEvalFileEx 0x22b (tcl86) 0xa5646: Tcl_EvalFile 0x36 (tcl86) 0x12606: qexe_evaluate_tcl_script 0x376 (comp_qexe) 0x11864: qexe_do_tcl 0x334 (comp_qexe) 0x16755: qexe_run_tcl_option 0x585 (comp_qexe) 0x380c3: qcu_run_tcl_option 0x1003 (comp_qcu) 0x160aa: qexe_run 0x39a (comp_qexe) 0x16e51: qexe_standard_main 0xc1 (comp_qexe) 0x2233: qfit2_main 0x73 (quartus_fit) 0x12e98: msg_main_thread 0x18 (CCL_MSG) 0x1467e: msg_thread_wrapper 0x6e (CCL_MSG) 0x16660: mem_thread_wrapper 0x70 (ccl_mem) 0x12761: msg_exe_main 0xa1 (CCL_MSG) 0x287e: __tmainCRTStartup 0x10e (quartus_fit) 0x17c23: BaseThreadInitThunk 0x13 (KERNEL32) 0x6d4d0: RtlUserThreadStart 0x20 (ntdll) End-trace Resolution This problem has been fixed with the Intel® Quartus® Prime Standard Edition software version 20.1.1. Custom Fields values: ['novalue'] Troubleshooting 14013334375 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 20.1 18.1.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']