If you just newly installed Roots Bootstrap Theme for WordPress and just uploaded it to your server and activated the theme and are seeing confusing errors that read like this:
Warning: file_get_contents(/var/www/xhtmlwebdesign.com/wp-content/themes/roots-master/assets/manifest.json): failed to open stream: No such file or directory in /var/www/xhtmlwebdesign.com/wp-content/themes/roots-master/lib/scripts.php on line 23
It’s because you need to run
grunt build
in Terminal (in your theme’s directory) to produce the files necessary for non-development environments (aka that manifest.json file that is missing). Voila!