Missing namespace for Class

Does anybody have any hint how I can remove warning:

[W] Missing namespace for MyApp.base.ApplicationController, please define it in namespaces property of your Application class.

I already defined namespaces inside Application.js but it does not help.

Code:

namespaces: [
    'MyApp.base'
],

Thank you in advance.

One suggestion - is possible show those warnings in development version too? Currently some errors are generated only in testing / production version only.

Missing namespace for Class