Home 
Navigation
Troubleshooting "Serialization Error Action Needed" in Ready or Not
-
Verify Game Files: This is the first troubleshooting step. Ensure Steam isn't in offline mode. In your Steam library:
- Right-click Ready or Not.
- Select "Properties."
- Click "Local Files."
- Choose "Verify Integrity of Game Files."
Steam will check for and replace corrupted or missing files. Retry launching the game. If successful, the issue is resolved.
-
Remove Mods: Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), frequently cause this error. To remove mods:
- In your Steam library, right-click Ready or Not, select "Manage," then "Browse Local Files."
- Navigate to
ReadyorNot\Content\Paks. - Delete the
mod.iofolder.
This will disable all mods. Try running the game.
-
Reinstall Mods (One by One): Reinstall mods individually to identify the culprit. Check each mod's update date on Nexus Mods, Mod.io, or its source. Only install mods updated after July 2024 (the UE5 update). Install one, test the game, and repeat. If the error returns, the last installed mod is the problem. Unfortunately, pre-UE5 mods are incompatible.
-
Reinstall Ready or Not: As a last resort, uninstall and reinstall Ready or Not completely. While less common, hard drive corruption could also be a factor. However, outdated mods are the most frequent cause of this error.
Ready or Not is available on PC.
Latest Articles
Latest Games
