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

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 Remove Mods: Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), are a frequent cause.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

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

3. Reinstall Mods (One by One): Reinstall mods gradually, checking for compatibility. Visit Nexus Mods, Mod.io, or your mod source:

   • Check the mod's last update date. Only install mods updated after July 2024 (UE5 implementation).
   • Install one mod, launch Ready or Not. If the error returns, the newly installed mod is the culprit; skip it. Repeat this process for each mod.

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 However, outdated mods are the most common cause of this error.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