Ready or Not might sound like a children's game, but it's anything but. This intense SWAT-themed first-person shooter (FPS) can be enjoyed in both single and multiplayer modes. However, players may occasionally encounter technical issues, such as the "Serialization Error Action Needed" error. Here's a comprehensive guide on how to fix this error in Ready or Not.

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

The "Serialization Error Action Needed" error in Ready or Not often comes with the message "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 the integrity of your game files as suggested by the error message. Ensure that Steam is not in offline mode, then 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.

Steam will check for any missing or damaged files and re-download them if necessary. After verification, restart Ready or Not to see if the issue is resolved. If the problem persists, you may need to take further action.

2. Remove Any Mods

Mods can sometimes cause the "Serialization Error Action Needed" error, especially if they are outdated or incompatible with the latest Unreal Engine 5 update. Here's how to remove mods:

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

This should allow the game to run without mods. However, you'll need to reinstall your mods if you wish to use them again.

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

3. Reinstall Your Mods

Once you've removed your mods, you can start reinstalling them one at a time to identify which mod might be causing the error:

• Visit Nexus Mods, Mod.io, or your preferred mod source.
• Check the update date of each mod. Ensure it was updated after July 2024, when Ready or Not transitioned to Unreal Engine 5.
• Install a mod, then launch the game to test it. Repeat this process for each mod.

If the error reappears after installing a particular mod, that mod is likely incompatible with the current version of Ready or Not. You'll need to skip it until it's updated for Unreal Engine 5.

If all else fails, consider uninstalling and reinstalling Ready or Not from scratch. Though less common, hard disk corruption could also be a factor, but most reports of this error relate to outdated mods.

By following these steps, you should be able to resolve the "Serialization Error Action Needed" error in Ready or Not.

Ready or Not is available now for PC.