Macintosh HD can't be opened because the original file can't be found I'm getting the "Macintosh HD can't be opened because the original file can't be found" error when trying to open Macintosh HD from the sidebar of Finder.

Happening since I installed macOS High Sierra. (I'm using a 2010 MacBook Pro with 256GB SSD)

How do I fix that? How can I open that directory?
What happens when you click on the Macintosh HD icon on the Desktop?

Try dragging the Macintosh HD icon out from the sidebar, then drag the Macintosh HD icon from the Desktop into the sidebar to recreate it.