Layers Property Manager Missing

When I press the LPM nothing pops up on my screen and it looks like the command line doesn’t recognize it. It also doesn’t recognize the command when I type “Layers” in the command line. How can I fix it and find my LPM?

Follow the steps this link
https://www.landfx.com/kb/autocad-fxcad/ribbons/item/3068-manager-missing.html