The startup config script is stored in your local Sims 4 folder. Removing it forces the game to regenerate a fresh one.
Here's how to fix it:
Right-click The Sims 4 in your library, go to Properties > Installed Files > Verify integrity of game files . 2. Clear Local Thumb Cache Corrupt temporary files can cause startup failure. Navigate to Documents\Electronic Arts\The Sims 4 . Delete the localthumbcache.package file. Restart the game. 3. Run as Administrator
This error usually occurs after a game update, when installing new content, or when the configuration files get corrupted. As of early 2026, with the latest patches implemented, this error often stems from conflicts in the folder or damaged game files. The startup config script is stored in your
Whether you are a casual player who just installed a new game update or a power-user tweaking graphics for realistic lighting, this troubleshooting guide covers everything you need to get your game up and running again. Why This Error Happens
This is the most effective way to rule out file corruption without losing your saves. Go to Documents > Electronic Arts . Rename "The Sims 4" folder to "The Sims 4_Old". Launch the game. It will generate a fresh, clean folder.
For many The Sims 4 players, nothing is more frustrating than settling down for a gaming session only to be met with a jarring error message. One of the most persistent and cryptic errors, particularly for those trying to customize their game, is: . Delete the localthumbcache
If you are seeing the error: , you are not alone. This specific error has plagued players since the Horse Ranch and For Rent expansions, but it continues to appear after patches, game updates, or mod installs.
Corrupted files often cause configuration errors. A repair will check all game files and replace any that are damaged. Open the EA App and go to My Collection . Click the three dots ( ... ) on The Sims 4 icon. Select Repair . Steam: Go to your Library. Right-click on The Sims 4 .
. If there are any files inside, delete them and try launching the game. Run a Game Repair : Open the , go to your , click the three dots on The Sims 4 tile, and select . This will verify and replace any core files that may have been accidentally edited or corrupted. Reset User Files : Temporarily move your entire The Sims 4 folder from Documents > Electronic Arts perform a :
Did this start happening or after downloading new CC/Mods ? Are you playing on PC or Mac ? Do you use OneDrive to back up your Documents? I can give you more specific steps once I know your setup!
Here’s how to fix it, from most to least likely to work:
If you have used custom configuration tools, installed graphic rule overrides, or used specific mods, they might be stored in a special override folder. Navigate to Documents > Electronic Arts > The Sims 4 . Look for a folder named ConfigOverride .
If the game works, move your saves , screenshots , and mods folders from the old folder to the new one, testing after each move. 2. Perform a Clean Boot
If none of the above works, perform a :