Sdkbox not defined. chartboost plugin in cocos2d-js 3.8

I successfully integrated sdkbox with chartboost plugin in my project.As I follow the document and I implement the chartboost ,like sdkbox.PluginChartboost.init(); .But it fails to load says sdkbox not defined.

And I compile the project in android ,but it does not show the interstitial video any.

Hello @johnramesh

Please check with our Chartboost sample -
https://github.com/sdkbox/sdkbox-chartboost-sample

Also, please post these threads with sdkbox tags, so that it would be easy for us to track.
Let us know, if it works for you with latest version of plugins from sdkbox.

Best,
Pabitra

Where are you seeing this log? After you run your app/project on your phone or simulator?