Home News How To Fix ‘Serialization Error Action Needed’ in Ready or Not

How To Fix ‘Serialization Error Action Needed’ in Ready or Not

Author : Christopher Mar 06,2025

Troubleshooting "Serialization Error Action Needed" in Ready or Not

Ready or Not Serialization Error

Screenshot via The Escapist

The dreaded "Serialization Error Action Needed" in Ready or Not, often accompanied by "Corrupt data found, please verify your installation," is a common Unreal Engine issue. Here's how to resolve it:

Verify Game Files: This is the first line of defense. 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, you're done!
Disable Mods: Outdated or incompatible mods, especially those not updated for Unreal Engine 5 (post-July 2024), are frequent culprits. To remove mods:
- 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 resolve the error, but you'll temporarily lose your mod functionality.
Reinstall Mods Selectively: Reintroduce your mods one at a time. Check each mod's update date on Nexus Mods, Mod.io, or its source. Only reinstall mods updated after July 2024 (the UE5 update). After installing a mod, test Ready or Not. If the error returns, the last installed mod is the problem; skip it. Incompatible mods will not work with the UE5 version.
Clean Reinstall (Last Resort): If all else fails, uninstall and reinstall Ready or Not completely. While less common, hard drive corruption could also be a factor. However, outdated mods are the most likely cause of this error.

Ready or Not is available now on PC.

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