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I'm trying to rip the rental version of the movie "About Time." It always fails with a disc error. I have tried a different disc and I always get the same error. Are there different settings I could be using, or any tips on how to make this happen? Sorry, I'm away from my home computer right now, so I can't give the exact error that I'm receiving.

"Something is wrong with my car. What can I do?"

That's the real-world of equivalent of your question, when you don't include what the errors are.

Of course, support for MakeMKV is only for ripping movies you own, not rental versions.