The "Machine" is just having a little fun. The Backyard Professor is mildly entertaining but a terrible teacher and has been the subject of much scorn and derision. If you're trying to do the CM lessons in either sequential or adaptive mode that might be part of the problem. You're usually better off just trying to pick out courses that appeal to you. Lots of good beginner courses. Next time you decide to do Chess Mentor instead of hitting that big orange "start training" button look just to the right of it and choose "view courses" instead. I'd advise going to the second page and do all the beginner courses in openings, endgame, strategy and checkmate/tactics. Don't be afraid to go back and review them either. I've done some lessons 20 times or more so you're not the only one who finds the courses hard.
I'd also advise changing your tactics trainer to unrated (it's in "settings":don't forget to save the settings). Time pressure is not your friend at the moment. You need to build up your skill set and self confidence first. Don't forget to check out some of the beginner videos as well and good luck with your game.
I am having great trouble in understanding the mentor lessons. I am not a grand master, just a novice. What is the reason for continuing with the lessons?
Is there a better way for the beginner?