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@NekoPrincess13 Hello! I did some research and found that error code 125 is caused by outdated / broken mods. Please move your mods to the desktop and delete the localthumbcache.package file located in the Documents / Electronic Arts / The Sims 4 folder before opening the game for testing. If you no longer get the error, then you can start testing your mods a little at a time. If you have a lot of mods / CC, the 50/50 method works best. Click the spoiler to see suggested steps.
1. Create a new game for testing so that your current save is left unchanged until you've identified the problem mods/CC.
2. Create a couple folders your desktop; perhaps one labeled "Tested Safe Mods-CC" and another labeled "Mods-CC Needs Testing". This will keep tested mods separated.
3. Exit the game and divide your mods/CC in half; put one half in the Needs Testing folder and put/keep the other half into the Documents / Electronic Arts / The Sims 4 / Mods folder.
4. Delete the localthumbcache.package file, located in the Documents / Electronic Arts / The Sims 4 folder before opening the game with the half you're testing,
5. If the game works with that half, exit the game, move that half to the Safe Mods-CC folder and move the remaining "Needs Testing" mods back to the Mods folder to test (Again, delete that cache file before opening the game.)
6. Once you know which half is causing the issue, divide those in half, keeping one half in the "Needs Testing" folder and one half in your Mods folder, and test again (delete the cache file each time after moving mods/CC and before opening the game).
7. Repeat this process until you find the culprit(s).
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