processXmlResource cannot reach the xml file

I'm trying to replicate this hello world example with Haxe and HaxeUI. When i compile the project everything seems fine but when i try to execute the swf from browser i have an error like: Cannot access a property or method of a null object reference referred to processXmlResource (in the root folder i have the main.hx and in a subfolder the xml).

Below is the screenshot of the error i get:

Have you modified your applications application.xml (or project.xml) to find the asset in your project root? Or put all your assets in an assets sub folder and let then reference that from you application.xml?

Basically it seems it is not finding your xml resource. This sample might be a good example of a basic project setup: https://github.com/ianharrigan/haxeui/tree/master/samples/hello_world_xml