When I try to build my project I get the following error:

events.js:72
throw er; // Unhandled 'error' event
^
Error: '../../node_modules/material-design-fonticons/styles/mdfi.css' wasn't found in file node_modules\material-ui\docs\dist\less\scaffolding.less line no. 9

But if I go into scaffolding.less and change the path from:

@import (less)"../../node_modules/material-design-fonticons/styles/mdfi.css";

to:

@import (less)"../../../node_modules/material-design-fonticons/styles/mdfi.css";

then it works again.