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

*Ready or Not* may sound like a simple game for kids, but this intense SWAT-themed FPS for single and multiplayer is anything but child's play. However, players may occasionally encounter technical issues. 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 message “Serialization Error Action Needed” usually comes with the additional warning “Corrupt data found, please verify your installation.” This issue stems from an Unreal Engine error, and there are several effective solutions to consider.

1. Verify Your Installation

The first step to resolving this error is to follow the prompt 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' and click on 'Verify Integrity of Game Files.'
• This process will scan for any missing or damaged files and re-download them if necessary. After completing this step, relaunch *Ready or Not* to check if the issue is resolved. If the problem persists, further action may be required.

2. Remove Any Mods

The “Serialization Error Action Needed” can also be triggered by outdated or corrupted mods, especially if they are not compatible with Unreal Engine 5. To remove mods, follow these steps (via CosmoCart):

• In your Steam Library, find *Ready or Not* and left-click on 'Manage,' then 'Browse Local Files.'
• Navigate to the 'ReadyorNot' folder, then into the 'Content' folder, and finally into 'Paks.'
• Delete the 'mod.io' folder by left-clicking and pressing the delete key or right-clicking and selecting 'Delete.'
• This should allow the game to run without mods, but you'll need to reinstall them if you want to continue using them.

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

3. Reinstall Your Mods

To safely reinstall your mods, visit Nexus Mods, Mod.io, or your preferred modding platform. Before installing any 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 one mod at a time, launch the game after each installation to ensure no errors occur. If the “Serialization Error Action Needed” reappears, the last installed mod is likely the culprit and should be removed.
• Remember, mods not updated for UE5 compatibility cannot be used.

If these steps do not resolve the issue, consider uninstalling and reinstalling *Ready or Not* entirely. While it's rare, hardware issues like a corrupted hard disk might also be a factor, but most cases of this error are related to outdated mods. This guide should help you fix the “Serialization Error Action Needed” in *Ready or Not* and get back to your tactical gameplay.

*Ready or Not is available now for PC.*