Internal Error: Sub-system: PDPW, File: /quartus/sys/pdpw/pdpw_frame_wnd.cpp, Line: 440 - Internal Error: Sub-system: PDPW, File: /quartus/sys/pdpw/pdpw_frame_wnd.cpp, Line: 440 Description Due to a problem in the Quartus® Prime Pro Edition Sofware version 17.1 Update 2, you may see this internal error when opening the Interface Planner. Resolution To work around this problem delete all the files in the Unix's /tmp directory. For Windows, reboot the PC. This problem is fixed beginning with the Quartus® Prime Pro Edition Software version 19.1 Custom Fields values: ['novalue'] Troubleshooting 2205696506 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 19.1 17.1.2 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']