How To Fix ‘Serialization Error Action Needed’ in Ready or Not

Troubleshooting "Serialization Error Action Needed" in Ready or Not

1. Verify Game Files: This is the first troubleshooting step. Ensure Steam isn't in offline mode. Navigate to your Steam Library, right-click Ready or Not, select Properties, then Installed Files, and finally Verify Integrity of Game Files. Steam will automatically redownload any corrupted or missing files. Restart the game to see if the issue persists.

2. Remove Mods: Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), are frequent culprits. To remove mods:

   • Access your Ready or Not local files via Steam Library > Manage > Browse Local Files.
   • Navigate to ReadyorNot\Content\Paks and delete the mod.io folder.

   This will disable all mods. Test the game; if it works, proceed to step 3.

3. Reinstall Mods (One by One): Reinstall your mods individually to pinpoint the problematic one. Check each mod's update date on Nexus Mods, Mod.io, or your preferred source. Only install mods updated after July 2024 (UE5 implementation). Install a mod, test the game, and repeat. If the error returns, the last installed mod is the cause. Unfortunately, pre-UE5 mods are incompatible.

4. Reinstall Ready or Not: As a last resort, uninstall and reinstall Ready or Not completely. While less likely, hard drive corruption could also be a factor. However, outdated mods are the most common cause of this error.

Ready or Not is available on PC.