How To Fix ‘Serialization Error Action Needed’ in Ready or Not

Ready or Not, despite its name, isn't a children's game. This intense single and multiplayer SWAT FPS delivers realistic tactical action, but occasionally, technical hiccups can interrupt the gameplay. One such issue is the dreaded "Serialization Error Action Needed" message. Let's dive into how to fix it.

Tackling the "Serialization Error Action Needed" in Ready or Not

The "Serialization Error Action Needed" error, often accompanied by "Corrupt data found, please verify your installation," is typically an Unreal Engine issue. Here's a breakdown of solutions:

1. Verify Game Files

The game itself suggests the first step: verifying your installation. This checks for missing or corrupted files. Here's how:

1. Open your Steam Library.
2. Right-click on Ready or Not and select "Properties."
3. Navigate to "Local Files" and click "Verify Integrity of Game Files."
4. Steam will scan and re-download any necessary files. Try launching the game again. If this works, you're all set!

2. Remove Mods

Outdated or incompatible mods, especially those not updated for Unreal Engine 5, are a common culprit. To remove mods:

1. Open your Steam Library.
2. Right-click Ready or Not, select "Manage," then "Browse Local Files."
3. Navigate to ReadyorNot\Content\Paks.
4. Delete the mod.io folder.

This will resolve the issue, but you'll lose your mods temporarily. See step 3 for how to reinstall them selectively.

3. Reinstall Mods Selectively

Reinstall your mods one by one, checking their update dates. Mods updated after July 2024 (when Ready or Not transitioned to UE5) are more likely to be compatible. Install a mod, test the game, and repeat. If the error returns after installing a specific mod, that's the problem mod—skip it. Incompatible mods (those not updated for UE5) simply won't work.

Last Resort: Reinstall the Game

If all else fails, a clean reinstall of Ready or Not might be necessary. While less likely, hard drive corruption could also be a factor. However, outdated mods are the most frequent cause of this error.

Ready or Not is available now for PC.