Getting DRM Error while playing video.

I want to play DRM Protected video in Roku, For that I had attached the code and the Error which I'm getting, I need WidevineBody as parameter to fire LicenseUrl to play the content ig. I had videoUrl, LicenseUrl. Can anyone suggest any solution how to get WidevineBody from Roku Player.

I didn't find any solution on how to get WidevineBody as response from VideoPlayer, If I use same API / DRM Content for other Languages/framework for playing video there videoPlayer will return WidevineBody the we will fire with LicenseUrl to play the content, but in Roku I didn't find any solution for how to get WidevineBody from Video Player.