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Fix: 1 file failed to validate and will be reacquired

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  • 5 min read

Steam is one of the world’s most popular PC gaming platforms and is used daily by millions of players worldwide. It’s also one of the largest PC gaming markets available, where gamers can buy just about every game from any category and often for a discount.

However, as good as the platform is, it sometimes runs into seemingly random bugs and glitches. In this article, we’re talking about the “1 file failed to validate and will be reacquired” error on Steam, its causes, and how to fix the problem.


What causes the “1 file failed to validate and will be reacquired” error?

The error can be caused by several different issues, including but not limited to the following:

  • Missing or corrupt game files.
  • Outdated game version. 
  • Third-party mods that might interfere with game files.

Also read: Fix: An error occurred while setting account details on Steam


How can the “1 file failed to validate and will be reacquired” error be fixed?

Here are six fixes you can try out.

Disable mods

Disabling any installed mods is a rather easy way of resolving the error. Remember that the exact process for disabling mods can vary from game to game, so be careful to remove mods and not any game files if mod uninstallation requires manually moving files around. Once you remove all mods, launch the game to check if it runs properly.ย 


Force restart Steam

Sometimes, forcefully quitting Steam and restarting can fix such issues. 

Step 1: Open the Task Manager by pressing Windows Key + X to open the quick access menu and select the right option.

This is an image of fix ping task manager 1

Step 2: Find and close all Steam-related processes by right-clicking them and selecting End Task. 

This is an image of steam close task manager 23

Once all processes are closed, start Steam as you normally would. 

If youโ€™re using macOS instead, you must use the Force Quit option in theย Appleย menu. After youโ€™ve clicked the option, selectย Steamย from the list of applications that appear and click Force Quit.ย This should close the program.

Also read: What does โ€œNot Secureโ€ mean in the address bar? What to do?


Verify game files

Corrupt or missing game files can also cause such an error. Follow these steps to verify game file integrity. 

Step 1:ย Head to your Steam Library, right-click Fall Guys, and selectย Properties.

How to fix the 'vac was unable to verify your game session' error?

Step 2: Head over to the Local Files tab.

How to fix the 'vac was unable to verify your game session' error?

Step 3: Click on Verify integrity of local filesโ€ฆ and let Steam do its thing. 

How to fix the 'vac was unable to verify your game session' error?

Try running or downloading your game again to see if that fixed the error.


Check the Windows Firewall

Itโ€™s also a good idea to check whether your Windows Firewall is blocking Steamโ€™s connection to its servers. If your firewall is improperly set up or has blocked Steam, it wonโ€™t be able to connect, giving you this error.ย 

Check out our detailed guide to know how to unblock programs from the Windows Firewall

Run the Check Disk utility

Such errors can indicate your drive failing to perform as it should. Try running the check disk utility to check whether or not your storage drives are, in fact, functional.ย 

You can refer to our detailed guide here on how to run the check disk utility

Flushing Steam data

You can flush any Steam configurations on your PC using a special Steam command and restart the program. You must open theย Runย utility by pressingย Windows Key + Rย and run the following command.

steam://flushconfig
This is an image of steam flushconfig

Steam will launch and ask for confirmation. Clickย OKย to continue, and youโ€™re good to go. Remember that youโ€™ll have to log into your Steam account again afterwards. If youโ€™re on macOS, you can run the aforementioned command as a browser URL and any browser you choose.ย 

Keep in mind that if you’ve disabled Steam Cloud saves, either enable them before following the aforementioned fix or avoid it altogether, as you might lose all in-game processes once Steam data is flushed.ย 

Also read: Fix: Error communicating with Steam servers

Yadullah Abidi

Yadullah Abidi

Yadullah is a Computer Science graduate who writes/edits/shoots/codes all things cybersecurity, gaming, and tech hardware. When he's not, he streams himself racing virtual cars. He's been writing and reporting on tech and cybersecurity with websites like Candid.Technology and MakeUseOf since 2018. You can contact him here: yadullahabidi@pm.me.

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