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. In your Steam Library:

   • Right-click Ready or Not.
   • Select "Properties".
   • Click "Local Files".
   • Choose "Verify Integrity of Game Files".

   Steam will scan and replace any corrupted or missing files. Retry launching the game. If the issue persists, proceed to the next steps.

2. Remove Mods: Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), frequently cause this error.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.io folder.

   This will disable all mods. Test the game. If successful, move to step 3.

3. Reinstall Mods (One by One): Reinstall your mods individually to identify the culprit. Check each mod's update date on Nexus Mods, Mod.io, or its source. Only reinstall mods updated after July 2024 (when Ready or Not transitioned to UE5). Install one, test the game, and repeat. If the error returns, the last installed mod is the problem; skip it.

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 However, outdated mods are the most common cause of this error.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.