Error: An unexpected error occurred during Save System: - Error: An unexpected error occurred during Save System: Description Due to a problem in the Intel® Quartus® Prime Pro Edition Software version 17.1 and earlier, you may see this java exception when saving your Platform Designer system. Error: An unexpected error occurred during Save System: java.lang.ClassCastException: com.altera.qsys.blackboxmodule.definitions.BlackboxDataObject cannot be cast to com.altera.entityinterfaces.IElementClass Resolution To work around this problem, delete the .ipxact file associated with the Platform Designer system you are saving. This problem is scheduled to be fixed in the future release of the Intel® Quartus® Prime Pro Edition Software. Custom Fields values: ['novalue'] Troubleshooting FB: 512862 513338; False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 18.0 17.1 ['Arria® 10 FPGAs and SoCs', 'Stratix® 10 FPGAs and SoCs'] ['novalue'] ['novalue'] ['novalue']