"One or more SHX files are missing. What do you want to ... - Autodesk
If you have the file and need to add it to AutoCAD, follow these steps from Autodesk Support Font Naskhd.shx
: SHX fonts reduce system load compared to TTF fonts because they are simpler for CAD software to process and plot. How to Install Naskhd.shx "One or more SHX files are missing