No food plates in their inventory, just books. 

I received the Flagrant System Error message yesterday evening. I was able to save the game and it loaded fine on the next boot of the program. Earlier last evening during game play, I had changed the BooksNotMagicScrolls setting to false so I thought that maybe that had caused the error. But I received the same error message today during game play without changing the setting.

It may be coincidence but both times the error appeared around an age-up event. I think last nights was after and today's was before. In both cases, the sim experiencing the age-up was reading a book at the time. Also, I discovered today I was missing some skill books that I had previously -- not sure when they came up missing though; Cook 2 & 3, Gardening 2 & 3, Handiness 2 & 3.

Below are the mods I have installed...

AM created on 07/23
ISM .5b version (no core)
LessGhosts
MyBooks (my own tuning mod to create Writing and Guitar skill books, also allows children to read skill books, plus enable Gift of Life book to be purchased from Store)
noautoputawayfirepit
nomosaic
pottytrainingx10
AutoTFB (my own tuning mod to allow auto Try For Baby with 15% chance of preg)

Please let me know if you need more information. I'm not overly attached to my sims so if there is something you would like me to try, let me know.