"Fix 'Serialization Error' in Ready or Not: Action Needed"

*Ready or Not* might sound like a kid's game, but there's nothing child-friendly about this intense single and multiplayer SWAT FPS. However, you might occasionally encounter technical issues. Here's a detailed guide on how to fix the "Serialization Error Action Needed" in *Ready or Not*.

How To Tackle 'Serialization Error Action Needed' in Ready or Not

Screenshot via The Escapist

The *Ready or Not* error "Serialization Error Action Needed" is typically accompanied by the message "Corrupt data found, please verify your installation." This is an Unreal Engine error, and there are several effective methods to resolve it.

1. Verify Your Installation

The first step is to verify your installation as suggested by the error message. Ensure Steam is not set to offline mode, then follow these steps:

• Go to your Steam Library and find *Ready or Not.*
• Right-click on it and select Properties.
• Click on Installed Files.
• Click on Verify Integrity of Game Files.

This process will check for any missing or damaged files. If Steam detects any issues, it will re-download the necessary files. After verification, try running *Ready or Not* again. If the game launches successfully, you're all set. If not, you might need to take further action.

2. Remove Any Mods

The "Serialization Error Action Needed" can also be triggered by outdated or broken mods, especially those not updated for Unreal Engine 5. To remove mods, follow these steps (via CosmoCart):

• Go to your Steam Library and find *Ready or Not.*
• Left-click on Manage and then Browse Local Files.
• Double-click on the ReadyorNot folder.
• Double-click on the Content folder.
• Double-click on Paks.
• Delete the mod.io folder by left-clicking on it and hitting the delete key or right-clicking and selecting delete.

After deleting the mods, the game should run without the error, though you'll be without your mods for the time being.

Related: Ready or Not: What's Better, DirectX 11 or DirectX 12 (DX11 vs. DX12)?

3. Reinstall Your Mods

To get your mods back, reinstall them one at a time. Visit Nexus Mods, Mod.io, or your mod source and check the update date for each mod. If a mod was updated after July 2024, when *Ready or Not* switched to UE5, it should be safe to install. Follow these steps:

• Install a mod and try running the game.
• If the error reappears, the last mod you installed is likely the cause. You'll need to skip it until it's updated for UE5.

If all else fails, consider uninstalling and reinstalling *Ready or Not* from scratch. While it's possible that your hard disk is corrupted, most reports of this error are linked to outdated mods. This comprehensive guide should help you resolve the "Serialization Error Action Needed" in *Ready or Not*.

*Ready or Not is available now for PC.*