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Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), frequently cause this error.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.io folder. 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 However, outdated mods are the most common cause of this error.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.