componentCssClassName or styleNamespace getting undefined in Ember 2.18.2

[Muniraj-Mallesh-E6144]

Hi,
I have used ember-component-css version 0.6.2 with Ember 2.18.2.
In my component, I am trying to access styleNamespace. But getting undefined.
Please find below code

<div class="{{styleNamespace}}--sample">
       Hi
 </div>