2019 Sims 4 CAS Sims not saving to Library!

I just added a new family into my game last night and not experiencing this at all. Have you tried without mods? As for version number, there's a text file in your Sims 4 folder in Documents that's called GameVersion, and if you open it up it'll tell you the exact version number of your game.

Ok but the mods I have worked with the Last Sims I made before now. So why is it suddenly not working? O.O 

Mods are at risk of breaking with every patch we get, so they need to be checked and the code verified up to date each time you patch your game. We just got a large update in November that changed the Python version for Sims 4, so for sure all script mods made from before November 2018 that haven't been updated are definitely not any good.

Custom content can cause crazy issues too (trust me, I know from learning this hard the way), so you should really test with all mods and custom content removed. Then put things back in small batches until you find whatever is triggering the problem and remove it.

You should also delete your localthumbcache file too whenever you add or remove mods, but I do it at the end of every play session to be on the safe side.

Hi @KayamiiOtaku

moving this to the tech forum for troubleshooting

Best to try without custom content or mods and see if it works then. If so, you need to find out what's causing the issue

Use the 50/50 method to find out what's bugged. http://modthesims.info/wiki.php?title=Game_Help:Finding_Problem_Custom_Content

I just had this happen to me!! 

@bernicenava

You have probably outdated UIC mod
Move the mods folder to the desktop.
Delete localthumbcache.package file in the game folder
Fix the game in Origin.
Origin/Library -right click on TS4 - option "Repair game"
You have to wait until Origin will fix all packs, not only the base game.
Turn on the game to create a new, empty mods folder and check if a game is working now without mods and CC.
Check if there are new updated versions of the mods and CC you are using.
Then copy from desktop your mods and CC and paste it in the new mods folder. First, paste script mods one by one every time checking if the game is OK. Do the same with CC but if you have a lot of this, try the 50/50 method. ( divide your CC into smaller batches for example 50 pieces in one subfolder and check these subfolders one by one)
You need to find a culprit and either remove it or replace it with an updated version

I don't work for EA

If your household is modded, make sure you check "Include Custom Content" under Advanced on the filters on the left side. I kept thinking mine were not saving, but I just had them filtered out by leaving the checkbox unmarked. 

These answers are not helping me at all. I've done everything suggested, I have the right boxes checked off, and still, none of my Save to My Library efforts work. Nothing is there, and it's quite frustrating because I run a YouTube channel devoted to speed builds and would like to have these lots made available on my Gallery page. I'll try to be patient waiting for the right answer to appear, but until then, I don't understand why it's happening. When you click the Save to My Library option and then say Yes, Save to My Library, that should be it. There shouldn't BE any problems with something so basic. Disappointed and sad.