javascript require is not defined

/*
Add require.js to your page

RequireJS is a JavaScript file and module loader.
It is optimized for in-browser use, but it can be used
in other JavaScript environments, like Rhino and Node.
Using a modular script loader like RequireJS will improve
the speed and quality of your code.

https://requirejs.org/
https://requirejs.org/docs/release/2.3.5/minified/require.js
*/

Try adding define('CONCATENATE_SCRIPTS', false); to your wp-config.php file just below the define('DB_HOST' line.