Resolve Serialization Error in 'Ready or Not' Game

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 automatically replace any corrupted or missing files. Retry launching the game. If successful, the issue is resolved.

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 Remove Mods: Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), are a frequent cause.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

   • Open your Steam library.
   • Left-click Ready or Not, then "Manage," and "Browse local files."
   • Navigate to ReadyorNot\Content\Paks.
   • Delete the mod.io folder.

   This will disable all mods. Attempt to run the game.

3. Reinstall Mods (One by One): If removing mods solved the problem, reinstall them individually to identify the culprit. Check each mod's update date on Nexus Mods, Mod.io, or your source. Only install mods updated after July 2024 (UE5 update). Install one, test the game, and repeat. If the error returns, the last installed mod is the problem.

4. Reinstall Ready or Not: As a last resort, completely uninstall and reinstall Ready or Not. 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 However, outdated mods are the most common cause of this error.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.