Due to a problem in the Intel® Quartus® Prime Standard Edition Software version 19.1 Windows* version onwards, you might see this error when generating the UniPHY-based External Memory Interface IP.
Install Windows Subsystem for Linux (WSL) on Windows OS for all Intel® Quartus® Prime Standard Edition Software version 19.1 Windows version onwards. For more details, refer to this article.
Additional workaround requirement if you are using Intel® Quartus® Prime Standard Edition software version 19.1 Windows. For more details, refer to this article.
Additional workaround if you are using Windows 10 version 19.03 and later. For more details, refer to this article.