Is my save corrupted? What do I do??

fruitteasosro​  I would absolutely download NRaas ErrorTrap, Overwatch, and MasterController, probably Register (not absolutely required but helpful), Traveler if you ever want your sims to travel, and possibly Traffic if Overwatch starts telling you it had to delete hundreds of cars per night.  (OW does this purge on its own, and a few dozen is fine, but more can drag down performance.)  All of them are described here:

Sims 3 - Common Game Fixing Mods - Hero Approved | EA Forums - 8291748

Install the mods, delete the five cache files in Documents > Electronic Arts > The Sims 3:

• CASPartCache.package
• compositorCache.package
• scriptCache.package
• simCompositorCache.package
• socialCache.package

Load your save, let the game clock run for a couple sim-minutes, then click City Hall or any in-game computer and select NRaas > MasterController > Town Options > Reset Everything.  The reset may take a few minutes to run, depending on the speed of your computer; when it's done, you'll get a notification.  Your own sims should also be playable again.

Let the game clock run for a few more sim-minutes, then "save as" and rename the save, quit, delete the cache files again, reload, and go back to playing.  ET and OW clean up save corruption on their own, without user input, so if you can recover your save right now, you may well be fine going forward, at least for a while.

If your sims still aren't playable, try evicting them in Edit Town, as I described earlier.  It may work better with the mods in place.

The normal suggestion is to run an MC reset every 6-8 in-game weeks, more if you notice performance lagging or other new issues.  And always keep a few backup saves just to be safe; you can delete the oldest ones when you're sure you won't need them.

Hey there!

Thanks for helping! Yes I’m ok with using mods. Which ones would help??

fruitteasosro​  Yes, this is a classic presentation of a corrupt save.  Are you willing to add some mods to help?  If so, let me know.

If not, the best you can do here is evict your sims in Edit Town and put them back in their house.  They'll keep their jobs and relationships (as long as you don't save them and replace them with the saved copy) but lose their promised wishes and opportunities.

If that doesn't help, try it on the backup save.  If you've created one or more yourself, try them, newest to oldest until you find a viable save.  But even if you never created a backup, the game will have saved the data from the second-to-last time you saved your progress.

Open Documents > Electronic Arts > The Sims 3 > Saves, and you'll see a folder with your save name and another with the same name and a .backup extension.  Rename the backup and remove the .backup extension, so the folder name ends in .sims3.  This save will now be available to load at the Main Menu.

Please keep in mind that this save may be close to corrupt as well.  I'd keep a spare copy around in case you need to revert to it again.  If you load it and can play, use "save as" to rename the save, so the previous backup remains intact as it was when you recovered it.