@nicoleflower888 Did you try loading a backup save? I don't mean playing a different save, I mean renaming the file from the second to last time you saved (or from the couple times before that) so that the game can read it. Please try the manual method described here:
https://sims4.crinrict.com/eng/2014/09/save-games/#wiederherstellen
It's possible though that you'll need to put at least some of your mods back in, that missing data from one of them is the reason this save won't load. You can copy your main save file and experiment on it in a clean Sims 4 folder, adding back in your mods a few at a time to see whether the save will load.
Even if this doesn't work, don't delete the save. There are some sporadic reports of people's saves being unplayable after the newest patch, and while we don't know why it's happening, it's possible this will be fixed in a future patch, or someone will figure out the problem and provide a workaround.
@BerberandImmy When you say you played another household, is that in the same save, or in a different one? If you haven't already, please try loading a different household within the same save. If it works, play that household for a few sim-hours, use "save as" to rename the save, quit, reload, and try to play your previously active household again.
If that doesn't work, try manually recovering a backup as described above. If that doesn't work either, the same applies to you too: don't delete your save, even if it's currently unplayable, because there might be a way to fix it.
I'm sorry I can't give a more definitive answer, but these crashes are still not well understood, and we really don't have a reliable way to get past them yet.
