[ARCHIVED] Orange/Green Exclamation signs over lots / Houses disappear

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Often (50% - 99%)
What is your current game version number? 1.80.69.1030
What expansions, game packs, and stuff packs do you have installed? Get to Work, Get Together, City Living, Cats & Dogs, Seasons, Get Famous, Island Living, Discover University, Eco Lifestyle, Snowy Escape, Cottage Living, Outdoor Retreat, Spa Day, Dine Out, Vampires, Parenthood, Jungle Adventure, StrangerVille, Realm of Magic, Dream Home Decorator, Movie Hangout Stuff, Kids room stuff, Vintage Glamour Stuff, Fitness Stuff, Toddler stuff ,Laundry Day, Tiny Living, and Paranormal stuff.
Steps: How can we find the bug ourselves? Put an external file into your saves from a flash drive.
What happens when the bug occurs? The external files say "restart required."(Which I don't know how to do) And when I open them there are simply hazard signs, and it's my most recent normal save file.
What do you expect to see? The correct save file ready to play.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? No

‌

So, my sims copy of the simsie save was working fine until I recently transferred over my nsb save using a flash drive. Now both of them say restart required. Whenever I open my game, I get my most recent normal save file and it has a bunch of warning signs on it. I've repaired my game, no change. I've taken out the save folder and placed it back in- no difference. What do I need to do?