Internal Error Sub-system ASM2, File quartuscompasm2asm2_regions_crf_assemble2.cpp, Line 397. - Internal Error Sub-system ASM2, File quartuscompasm2asm2_regions_crf_assemble2.cpp, Line 397. Description This error may be seen during compilation with Intel® Quartus® Prime Pro Edition Software version 21.1 and Intel® Quartus® Prime Pro Edition Software version 21.2. Resolution A patch is available to fix this problem for the Intel® Quartus® Prime Pro Edition Software version 21.1 and Intel® Quartus® Prime Pro Edition Software version 21.2. Please follow the steps below: (1) Download and install the patch from the appropriate link below. (2) Recompile your design. For the Intel® Quartus® Prime Pro Edition Software version 21.1, Download Intel® Quartus® Prime Pro Edition software version 21.1 Patch 0.42 for Windows (.exe) Download Intel® Quartus® Prime Pro Edition software version 21.1 Patch 0.42 for Linux (.run) Download the Readme for Intel® Quartus® Prime Pro Edition software version 21.1 Patch 0.42 (.txt) For the Intel® Quartus® Prime Pro Edition Software version 21.2, Download Intel® Quartus® Prime Pro Edition software version 21.2 Patch 0.29 for Windows (.exe) Download Intel® Quartus® Prime Pro Edition software version 21.2 Patch 0.29 for Linux (.run) Download the Readme for Intel® Quartus® Prime Pro Edition software version 21.2 Patch 0.29 (.txt) This issue will be fixed in Intel® Quartus® Prime Pro edition version 21.3 and onwards. Custom Fields values: ['novalue'] Troubleshooting 1509350134 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 21.3 21.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']