Emelyn702 Please test with no mods or custom content, as in, move the Mods folder to the desktop and delete localthumbcache.package. You don't need to save your progress, but I don't want to waste your time with other troubleshooting if you do in fact have a broken mod or cc item.
If this doesn't help, please open Documents > Electronic Arts > The Sims 4 and delete any lastexception files you see. Try again to load your main household, still with no mods or cc, and if/when it doesn't work, look for a new lastexception. If you find one, open the file, delete the first line of text, and then attach it to a reply here using the paper clip (Attachment) icon.