A serious error has occurred while loading [world name].
It is strongly recommended that you restart the program.
This error happens when the game is unable to load the save.
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If successful, it might be the third problem.
If not, try creating a new save file in Sunset Valley.
Now, refer to the following steps to solve Serious error has occurred.

Solution 1.
Then you’ve got the option to delete your older folder.
From this post, you might find some details on Sims 4 backup.

Solution 2.
Heres how to disable firewall:
Step 1.
TypeControl Panelin the search box and hitEnter.
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CheckTurn off Windows Defender Firewall (not recommended)for bothPrivateandPublic internet controls.
Then click onOKand reboot your setup to apply the changes.
After finishing your work, remember to re-enable them.
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Solution 3.
Hover overHelp> selectApp Recovery>CLEAR CACHE.
Then the EA app will nowclear cacheand restart.

cycle your game to see if it works fine.
Solution 4.
Offline Document in OneDrive
Sims 3 serious error while loading save would happen when you had OneDrive enabled.
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Microsoft launches offline mode in OneDrive for web.
This post provides more details for you and you’re free to know how to use it.
Solution 5.
In this case, you’re able to venture to recover your game save if you have one.
Want to restore individual files from backup but dont how?
This post offers you how to select files to restore from backups in 2 cases.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
Step 2.
Click onBack Up Nowto start.
This article suggests that you backup Steam Cloud saves to provide double protection for your precious gaming records.
Lets do it now!