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.
- Locate Ready or Not in your Steam Library.
- Right-click, select "Properties," then "Local Files," and finally "Verify Integrity of Game Files."
- Steam will scan and replace any corrupted or missing files. Retry launching the game. If successful, the issue is resolved.
2. Disable Mods:
Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), frequently cause this error.
- In your Steam Library, right-click Ready or Not, select "Manage," then "Browse Local Files."
- Navigate to
ReadyorNot\Content\Paks. - Delete the
mod.iofolder. This will disable all mods.
3. Reinstall Mods (One by One):
After disabling mods, reinstall them individually to identify the culprit.
- Visit the mod's source (Nexus Mods, Mod.io, etc.).
- Check the last update date. Only reinstall mods updated after July 2024 (the UE5 update).
- Install one mod, test the game. Repeat, installing one mod at a time, until the error reappears. The last installed mod is likely the cause and should be avoided until an update is available.
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 However, outdated mods are the most common cause of this error.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.
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