Even if you don't use mods, clearing the cache is a quick and harmless step that can solve many problems. Corrupted cache data is a frequent cause of startup errors. Navigate to Documents > Electronic Arts > The Sims 4 and delete the following:
This error prevents the game from launching and usually points to a breakdown in how the game reads its configuration files, custom mods, or temporary cache files.
I encountered a persistent startup error in The Sims 4: "Unable to start. There was an error processing the startup configuration script (exclusive)." The message appears immediately when launching the game and prevents any play. After trying the usual fixes (repairing game files, running as administrator, disabling mods, and updating drivers), the error still occurred intermittently—sometimes the game launches after multiple attempts, other times it won't start at all. Even if you don't use mods, clearing the
If the game starts normally, the issue lies somewhere in your old folder. You can safely copy your and Tray (saved households/houses) folders from "The Sims 4 Backup" back into the newly created "The Sims 4" folder. 6. Run the Game as an Administrator (Windows)
Documents ➔ Electronic Arts ➔ The Sims 4 ➔ ConfigOverride Open your (Windows) or Finder (Mac). Navigate to your user document directory. Open the ConfigOverride folder. I encountered a persistent startup error in The
This file tells The Sims 4 how to read your Mods folder. If it is damaged, the startup configuration fails.
If you are still stuck after all these steps, visit the official EA Answers HQ or the Sims After Dark Discord, and attach your lastException.txt file from Documents\Electronic Arts\The Sims 4 . Do not reinstall Windows for this error—it is almost never an OS issue, but a file permission or rogue process issue. If the game starts normally, the issue lies
Happy Simming!
Corrupted temporary data in the launcher can prevent the startup script from executing properly.
If the steps above do not work, your entire user profile configuration might be broken. You can reset the folder without losing your saves. Navigate to Documents > Electronic Arts . Right-click folder and select Rename . Change the name to The Sims 4 Backup .