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 identify and redownload any corrupted or missing files. Retry launching the game; if successful, the problem is solved. If not, proceed to the next steps.

2. Disable Mods:

Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), frequently cause this error. To remove mods:

• Locate Ready or Not in your Steam Library.
• Click Manage, then Browse Local Files.
• Navigate to ReadyorNot > Content > Paks.
• Delete the mod.io folder.

This will resolve the error, but you'll lose your mod functionality temporarily.

3. Reinstall Mods (One by One):

Reinstall your mods individually to pinpoint the culprit. Check each mod's update date on Nexus Mods, Mod.io, or your 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 – it's likely incompatible with the UE5 version of Ready or Not.

4. Last Resort: Reinstall the Game:

If all else fails, a clean reinstall of Ready or Not might be necessary. 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 However, outdated mods are the most common cause of this error.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.