Troubleshooting "Serialization Error Action Needed" in Ready or Not

1. Verify Game Files

Begin by verifying your game files through Steam. 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 problem is solved. If not, proceed to the next steps.

2. Disable Mods

Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), frequently cause this error. To remove mods:

• Open your Steam Library, locate Ready or Not, and click "Manage," then "Browse Local Files."
• Navigate to ReadyorNot\Content\Paks and delete the mod.io folder.

This will resolve the error, but you'll lose mod functionality temporarily.

3. Reinstall Mods Selectively

Reinstall your mods one by one, checking each mod's update date on Nexus Mods, Mod.io, or your preferred modding platform. Only install mods updated after July 2024 (when Ready or Not transitioned to UE5). After installing a mod, test the game. If the error reappears, the newly installed mod is the culprit; skip it. Incompatible mods cannot be used with the UE5 version.

4. Last Resort: Reinstall the Game

If all else fails, a clean reinstall of Ready or Not is necessary. 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 However, outdated mods are the most common cause of this error.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 now on PC.