Sims won't finish books

I've looked online to see if there have been similar issues and I saw many were experiencing this over 7 years ago, and it still hasn't been fixed, even though it was claimed it was. I cannot complete the Ghost Historian aspiration because of it. My sim will stop about 80% though and will not resume it. I'm tried debugging, a new computer, starting a new book, but they won't even finish the second book either. I really don't want to cheat my game at this time. I just want this fixed.