How do I fix couldn't find LoaderGlobalNameHashes chunk in IoStore global.utoc?

[messylean]

My game crashes at launch with the message couldn't find LoaderGlobalNameHashes chunk in IoStore global.utoc and I'm not sure if this is a corrupted install or a packaging issue. Has anyone resolved this error, and what did you do to fix it?

 

[Jood]

This error usually shows up when the game’s IoStore files are mismatched or corrupted, basically, the global.utoc doesn’t line up with its .ucas or other chunks. The quickest fix I’ve seen work is verifying game files (Steam/Epic), which re-downloads any broken chunks. If you’re using mods or custom pak/utoc files, remove them first because they often cause this exact issue. Also, make sure you didn’t mix files from different game versions or updates. If it still happens, a clean reinstall (after deleting leftover game folders) usually sorts it out.

 

[rossgaller]

This error is typically caused by a bad IoStore. Check your game files (launcher/Steam), make sure all files are of the same build (all .utoc and .ucas files), and remove any residual mod/patch files. For developers, rebuild IoStore containers if you have missing LoaderGlobalNameHashes.

 

[joan]

This usually means your game files are mismatched or corrupted, first thing to do is verify your game files through Steam or Epic, and if you have any mods installed remove them first since they're often the culprit.

 

[Avika]

This error occurs when your game’s IoStore files are mismatched or corrupted. To fix it, verify your game files through Steam or Epic Games to repair broken chunks. Additionally, remove any installed mods and, if the crash persists, perform a clean reinstall by deleting the game folder.

 

[simran]

This error in Unreal Engine usually means the game’s data files (like .utoc or .ucas) are missing, corrupted, or don’t match the current version. The quickest fix is to verify game files through Steam or Epic Games Launcher