This error may be seen during Intel® L-tile and H-tile Avalon® Memory-mapped Intel® FPGA IP for PCI Express* example design generation with Intel® Quartus® Prime Design Software on Windows* operating system.
This error is caused by the maximum path length limitation of the Windows* operating system. To avoid this error, enable long path files in Windows* operating system. Refer to the following link for detailed information.
https://docs.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=cmd