Jaksta

Hi

I want to recording my skill-learning video from https://www.udemy.com/understanding-the-internals-of-the-unix-kernel-architecture/learn/lecture/7411140#overview

But Jaksta Media recorder says 'Error (unable to extract ...'

Can you tell me what's wrong?

Also, I have failure in recording of this youtube tv saying error (Stream has conte ...) 

https://tv.youtube.com/

This error keeps popping up in Jaksta Media recording'

Thx