var StartNode = require( 'view/action/StartNode' );
it should be
var StartNode = require( 'WOAS/view/action/StartNode' );
This will allow the sim code to work in the same require.js context as other sim code (or be loaded at other times), as to support things like https://github.com/phetsims/smorgasbord
For example, instead of:
it should be
This will allow the sim code to work in the same require.js context as other sim code (or be loaded at other times), as to support things like https://github.com/phetsims/smorgasbord