Simple and straightforward, the "HighlightIcon" icon does not exist. To find available icons, visit: https://material-ui.com/components/material-icons/
A helpful hint is provided here: "You may have forgotten to export your component from its defined file". Essentially, if you imported the icon like this:
const { HighlightIcon } = require("@material-ui/icons");
React will search for a class or function named HighlightIcon in @material-ui/icons. However, as previously mentioned, such a name does not exist.
If you modify your import statement to:
const { Highlight } = require("@material-ui/icons");
You will successfully import an existing icon (known as Highlight).