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

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

Author : Alexis Apr 24,2025

*Ready or Not* might sound like a kid's game, but it's a far cry from that—it's a gritty, tactical SWAT FPS designed for both solo and multiplayer enthusiasts. However, you might encounter some technical hiccups along the way. Here's a comprehensive guide on how to tackle the "Serialization Error Action Needed" in *Ready or Not*.

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

Photos of the Soft Objects for 23 Megabytes A Second in Ready or Not as part of an article about how to fix the 'Serialization Error Action Needed'

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 stems from the Unreal Engine and can be resolved through several steps.

1. Verify Your Installation

The first step is to follow the error message's suggestion and verify your game installation. Ensure Steam is not in offline mode, then proceed as follows:

  • Go to your Steam Library and locate *Ready or Not*.
  • Right-click on the game and select "Properties."
  • Click on "Installed Files."
  • Select "Verify Integrity of Game Files."

This process will check for any missing or damaged files and re-download them if necessary. After verification, relaunch *Ready or Not*. If the game runs smoothly, great! If not, further action is required.

2. Remove Any Mods

The "Serialization Error Action Needed" can also be triggered by outdated or broken mods, particularly those not updated for Unreal Engine 5. Here’s how to remove them:

  • 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.

After removing the mods, try running the game again. This should resolve the error but will leave you without your mods.

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

3. Reinstall Your Mods

To get your mods back, you need to reinstall them carefully:

  • Visit Nexus Mods, Mod.io, or your preferred modding site.
  • Check the last update date of each mod. Ensure it was updated after July 2024, when *Ready or Not* transitioned to Unreal Engine 5.
  • Install the mods one at a time, testing the game after each installation.

If the error reappears, the last installed mod is likely the culprit. Unfortunately, if a mod hasn't been updated for Unreal Engine 5, you won't be able to use it until it is.

If all else fails, consider uninstalling and reinstalling *Ready or Not* from scratch. Though less common, issues with your hard disk could also be at play, but most cases of this error are linked to outdated mods.

And that's how you fix the "Serialization Error Action Needed" in *Ready or Not*.

*Ready or Not is available now for PC.*

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