Fix 'Serialization Error Action Needed' in Ready or Not: Quick Solutions

*Ready or Not* may sound like a simple game of hide and seek, but it's far from it. This intense SWAT-themed FPS can throw some technical challenges your way, including the pesky "Serialization Error Action Needed" error. Let's dive into how you can resolve this issue and get back to the action.

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

Screenshot via The Escapist

The *Ready or Not* error message "Serialization Error Action Needed" usually comes with a prompt to "Corrupt data found, please verify your installation." This is an Unreal Engine error, and there are several ways to address it.

1. Verify Your Installation

The first step is to verify your game installation, as suggested by the error message. Here's how to do it on Steam:

• Ensure Steam is not in offline mode.
• Go to your Steam Library and locate *Ready or Not*.
• Right-click on the game and select "Properties."
• Navigate to "Installed Files" and click on "Verify Integrity of Game Files."
• Steam will check for any missing or corrupted files and re-download them if necessary.
• After the process, restart *Ready or Not* to see if the issue is resolved.

If this doesn't fix the problem, you might need to take additional steps.

2. Remove Any Mods

The "Serialization Error Action Needed" can also be triggered by outdated or broken mods, especially those not compatible with Unreal Engine 5. Here's how to remove them:

• Go to your Steam Library and find *Ready or Not*.
• Left-click on "Manage" and then "Browse Local Files."
• Open the "ReadyorNot" folder, then the "Content" folder, followed by the "Paks" folder.
• Delete the "mod.io" folder.

This should allow the game to run, but you'll be without your mods for now.

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

3. Reinstall Your Mods

To get your mods back, you'll need to reinstall them one at a time:

• Visit Nexus Mods, Mod.io, or your mod source and find the pages for your mods.
• Check the last update date of each mod. If it was updated after July 2024 (when *Ready or Not* switched to UE5), proceed with installation.
• Install one mod at a time, launch the game, and check for the error.
• If the error reappears, the last mod installed is likely the culprit. You'll need to skip it until it's updated for UE5 compatibility.

If all else fails, consider uninstalling and reinstalling *Ready or Not* from scratch. While hard disk corruption could be a factor, most cases of this error are linked to outdated mods.

That's your guide on how to fix the "Serialization Error Action Needed" in *Ready or Not*. With these steps, you should be back in the game in no time.

*Ready or Not is available now for PC.*