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foottoby
foottoby
New Participant
November 22, 2023
Solved

Unknown Cook Failure when launching on Quest 3 from Unreal 5

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.

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    HelderViniciusAnswer
    Honored Contributor
    November 30, 2023

    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?

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    5 replies

    HelderVinicius
    Honored Contributor
    November 22, 2023

    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
      foottobyAuthor
      New Participant
      November 30, 2023

      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.

      HelderViniciusAnswer
      Honored Contributor
      November 30, 2023

      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
        foottobyAuthor
        New Participant
        December 1, 2023

        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.

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