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

Ready or Not may sound like a playful game, but it's a serious SWAT-themed FPS that offers both single and multiplayer experiences. However, you might encounter technical issues like the "Serialization Error Action Needed." Here’s a detailed guide on how to resolve this error in Ready or Not.

How To Fix ‘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 the prompt "Corrupt data found, please verify your installation." This error is related to Unreal Engine, and there are several steps you can take to address it.

1. Verify Your Installation

The first step is to follow the error message's advice and verify your game installation. 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.
• Click on Verify Integrity of Game Files. This process will check for any missing or corrupted files and re-download them if necessary.
• After verification, relaunch Ready or Not to see if the error is resolved. If the issue persists, proceed to the next step.

2. Remove Any Mods

The "Serialization Error Action Needed" can also be triggered by outdated or malfunctioning mods, especially those not updated for Unreal Engine 5.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.
• Open the ReadyorNot folder, then the Content folder, and finally the Paks folder.
• Delete the mod.io folder to remove all mods. This should allow the game to run, but you will be without your mods.

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:

• Visit Nexus Mods, Mod.io, or your preferred modding platform.
• Check the update date for each mod. Only install mods updated after July 2024, when Ready or Not transitioned to Unreal Engine 5.
• Install one mod at a time, then run the game to check if the error reappears. If it does, the last installed mod is likely the cause, and you should avoid using it until it's updated for UE5.

If these steps don't resolve the issue, consider uninstalling and reinstalling Ready or Not from scratch. While hard disk corruption can be a factor, most reports point to outdated mods as the primary cause of the "Serialization Error Action Needed" in Ready or Not.

Ready or Not is available now for PC.