Your ongoing game is stressed and broken. Apparently its schools are broken, that's either part of the problem or a symptom but I can't even tell that. Unless you have new script errors to share, ones that are different from the recurring one uploaded previously, I have no further suggestions as to how to fix it, and it might not be fixable. Perhaps Chain does, but he has not yet returned to this thread. Until then, my official recommendation remains, that is to not play that ongoing game and if wanted attempt to transition your sims to a new one since you have shown that your NRaas mods are working well in a new test game.

Of course you don't have to take my official recommendation. One bump post after no further responses is okay but I'm sorry, continuing to play a broken game and repeatedly returning to say that it's broken is not really going to help.

Are you still receiving the same error? Did you get your schools sorted out?