Many players have reported they can’t play Fortnite because of Iostore.Signature error messages. For example, this is what one such player said, “I keep getting this message when trying to open Fortnite: IoStore.Signature_Error. Signature error detected when reading container header.” There are variations of that error, but they all include Iostore.Signature in them. This is how you can fix the Fortnite Iostore.Signature error on Windows PCs.
Clear the Paks Folder and Verify Fortnite
The most widely confirmed way to fix the Fortnite Iostore.Signature error is to clear the Paks folder and then verify the Fortnite game. Clearing that folder might erase corrupted data files, causing the error to arise. Then, players should run verification scans to replace data files. This is how you can fix the Fortnite Iostore.Signature error by clearing the Paks folder:
- Open the Games > Fortnite > FortniteGames > Content > Paks folder in File Explorer.
- Select all files in the Paks folder that range from 1 KB to 2,000 KB in size.
The Paks folder
- Next, open the Epic Games Launcher software.
- Click Library within Epic Games.
- Next, click on the three-dot button for Fortnite to select Manage.
- Select the Verify option.
The Verify option
- Wait for the verification scan to finish.
Clear the Shader Cache
Some players also say they’ve fixed the Fortnite Iostore.Signature error by clearing the shader cache. Applying this potential remedy might clear corrupted or outdated shader cache data. You can clear the shader cache with the Disk Cleanup tool like this:
- Hold the Windows logo key and press S to bring up the file finder box.
- Enter Disk Cleanup into the search box.
- Click on Disk Cleanup to open that utility.
- Select the C: drive and click OK.
- Next, click on the Clean up system files button and OK.
- Select the DirectX Shader Cache option. Additionally, you can select Windows Update Cleaner, Temporary Internet Files, Recycle Bin, and Temp files; however, Shader Cache is the essential checkbox.
The Disk Cleanup tool
- Click Delete to erase the shader cache data.
Reinstall the Fortnite Game
If the Fortnite Iostore.Signature error persists; try reinstalling the game. Reinstalling the game will also erase Pak data, but might also repair and restore other files. You can reinstall your Fortnite game like this:
- Start your Epic Games software.
- Click Library in the Epic gaming client.
- Next, click the three-dot button.
- Click Fortnite’s three-dot menu option to select Uninstall.
- Select Uninstall again to provide confirmation.
The Uninstall option
- Click the uninstalled Fortnite game and select Install.
There aren’t lots of confirmed ways to fix the Fortnite Iostore.Signature error on Windows PCs. However, those troubleshooting methods above will probably resolve that gaming issue for most players. You can also ask Epic’s help service for more ways to fix this Fortnite error by clicking Contact us on this page.
