"Fix 'Serialization Error' in Ready or Not: Quick Guide"

Ready or Not might sound like a kid’s game, but it's far from it. This intense single and multiplayer SWAT FPS can occasionally present technical challenges. Here's a comprehensive guide on how to resolve 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" often comes with the message "Corrupt data found, please verify your installation." This issue is rooted in Unreal Engine, but there are several effective solutions to address it.

1. Verify Your Installation

Start by verifying your game installation as suggested by the error message. Here’s how to do it:

• Ensure Steam is not in offline mode.
• Navigate to your Steam Library and locate Ready or Not.
• Right-click on the game and select Properties.
• Go 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 the process, launch Ready or Not to check if the error persists. If it does, proceed to the next step.

2. Remove Any Mods

The "Serialization Error Action Needed" can also be triggered by outdated or incompatible mods, particularly those not updated for Unreal Engine 5.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

• From your Steam Library, find Ready or Not.
• Left-click on Manage and then Browse Local Files.
• Open the ReadyorNot folder, then the Content folder, and finally the Paks folder.
• Delete the mod.io folder.
• Try running the game again to see if the issue is resolved.

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

3. Reinstall Your Mods

If you want to use mods again, reinstall them one at a time. Here’s how:

• Visit Nexus Mods, Mod.io, or your mod source, and find the pages for your mods.
• Check the update date of each mod. If it was updated after July 2024, when Ready or Not transitioned to UE5, it should be safe to install.
• Install a mod, then launch the game to test it. If the error reappears, the last installed mod is likely the cause. You'll need to skip that mod until it's updated for UE5 compatibility.

If none of these steps work, consider uninstalling and reinstalling Ready or Not entirely. While less common, issues with your hard disk could also be the culprit, but outdated mods are the most frequent cause of this error.

And that’s how to fix "Serialization Error Action Needed" in Ready or Not.

Ready or Not is available now for PC.