Unknown Cook Failure when launching on Quest 3 from Unreal 5

[foottoby]

I am trying to launch an Unreal project on Quest 3, but I always get the error PackagingResults: Error: Launch failed! Unknown Cook Failure. I have tried in two separate projects, one is empty and one made with the Unreal VR sample project. I am using Unreal 5.3.1, and I followed the meta quick start guide to make sure I have all the prerequisites. I have uploaded my log file. Any help on this would be great.

[Helder_Vinicius]

What about this log? Anything useful?

C:\Users\foott\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_5.3\Log.txt

[foottoby]

Just the same generic error as far as I can see, but here is that log file. I have tried in a new project and I set it up following these steps as well as the official guide from Meta that I originally tried and I still get the same error.

[Helder_Vinicius · Accepted solution]

This new log shows this new information:

Cook failed.

(see C:\Users\foott\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_5.3\Log.txt for full exception trace)
 

UnauthorizedAccessException: Access to the path 'C:\Program Files\Epic Games\UE_5.3\Engine\Programs\AutomationTool\Saved' is denied.

 
Is there any chance this folder is protected, or your windows security settings are messing up and preventing acess to that directory?

[foottoby]

Thanks so much for looking through that, I tried to pick it apart, but missed that line. There is certainly a good chance that security settings are causing issues as this is my company laptop. When I browse to that directory there is no AutomationTool directory. Presumably that is created during the cook packaging process? I will raise a ticket with IT to see what might be causing the access issues.

[foottoby]

Thank you so much for identifying the issue. I uninstalled UE5.3 and reinstalled it to a folder outside of Program Files and that fixed the issue.