sims 3 a serious error has occurred

i've been editing the whole of monte vista for the past month, editing every single family and every single lot in preparation for a new family i want to play. i'm a perfectionist when it comes to sims, everything has to look the way i want it to for my gameplay to be rich! i made sooo much progress and i would literally work for hours and hours until two days ago. i tried to save and quit my game and i got an error code 12 message: 'An unexpected error has occurred while saving: Error Code 12. Please consult the readme for details.' and i know that when this message pops up there is nothing one can do apart from just quit the game and lose any progress they made, but i really didn't want to do that. i read somewhere that if you make a sim travel to one of the WA worlds after getting error code 12, you are able to save and quit your game from there. so i did that and i saved and quit and it was all fine and then i went onto the game yesterday to make my sim return home to monte vista and i really didn't think there would be any problems. i pressed on her phone to make her return home and the loading screen came up which is completely normal and then suddenly after a few minutes of the loading bar moving the screen went black and a message popped up saying: 'A serious error has occurred while loading 'italian flowers.sims3:Monte Vista_0x0de07c83. It is strongly recommended that you restart the application.' so i restarted the application COUNTLESS of times and would click the phone for her to return home and the loading screen would come up and the same message would end up popping up. i've read just about everything on this problem and have tried so many ways to fix this but nothing is working and i just have a feeling im going to have to let this go and lose all my progress i just really dont want to ☹️ i was so excited to start properly playing...

i read that if you have different tabs or folders open while you play the sims it could lead to this error, but i never play with any tabs or folders on in the background. i have a few nraas mods like errortrap, mastercommander, overwatch, storyprogression and a few more and i literally have like 4 cc items that are just old cars. apparently nraas traveler mod helps with travelling issues or something like that so i downloaded it yesterdayl but it hasn't helped.

if anyone could help me with this i would really really appreciate it! <3 x

i have an acer nitro 5 

CPU: 2.3GHz Intel Core i5-8300H (quad-core, 8MB cache, up to 4.0GHz)
Graphics: Nvidia GeForce GTX 1050 ( 4GB VRAM); Intel UHD Graphics 630
RAM: 8GB SDRAM (DDR4)
Screen: 15.6-inch FHD (1,920 x 1,080) Acer ComfyView (IPS LED) LCD
Storage: 1TB HDD