*Ready or Not* might sound like a child's game, but don't be fooled—this tactical SWAT FPS is strictly for adults. While diving into its intense single and multiplayer action, you might encounter the pesky "Serialization Error Action Needed" issue. Fear not, here's a comprehensive guide to get you back into the action seamlessly.

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

Screenshot via The Escapist

The *Ready or Not* error "Serialization Error Action Needed" often comes with a message saying, "Corrupt data found, please verify your installation." This is an Unreal Engine error, and there are several steps you can take to resolve it.

1. Verify Your Installation

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

• 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 scan for any missing or corrupted files and re-download them if necessary. After completing this process, relaunch *Ready or Not*. If the game runs smoothly, your issue is resolved. If not, you may need to take further action.

2. Remove Any Mods

The error can also be triggered by outdated or malfunctioning mods, especially those incompatible with Unreal Engine 5. Here's how to remove them:

• From your Steam Library, find *Ready or Not*.
• Left-click on "Manage," then "Browse Local Files."
• Navigate through the "ReadyorNot," "Content," and "Paks" folders.
• Delete the "mod.io" folder to eliminate the mods.

This should allow the game to run without mods. If you miss your mods, proceed to the next step.

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

3. Reinstall Your Mods

Carefully reinstall your mods one at a time. Visit Nexus Mods, Mod.io, or your mod source, and check the last update date on each mod's page. Only install mods updated after July 2024, when *Ready or Not* transitioned to Unreal Engine 5.

• Install a mod and then launch the game to test it.
• If the error reappears, the last mod installed is likely the culprit. Remove it and continue with the next mod.

If you still encounter issues after these steps, consider a full uninstall and reinstall of *Ready or Not*. While rare, hard disk corruption can also cause this error, but outdated mods are the most common source of the problem.

By following these steps, you should be able to resolve the "Serialization Error Action Needed" in *Ready or Not* and get back to enjoying this thrilling tactical FPS. *Ready or Not* is available now for PC.