Failed to open descriptor file on Android

Development Platform & Builds Mobile
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1

I put patch file in sdcard/ue4game/project/project/Content/Paks/ and got Failed to open descriptor file error. Both shipping and develop build have this issue.What should I do?

2

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How did you create your patch file for your project? Are you able to reproduce this in a sample project, or is it only happening in your original project?

Thanks! :slight_smile:

3

Hi ,
I use the ThirdPerson C++ sample project, the profiles of shipping release&patch are exactly same as official document. When I copy the Pak file to sdcard\UE4Game\PakTest\PakTest\Content\Paks and reopen the app, same popup message shows:“Failed to open descriptor file ‘’…/…/…/PakTest/PakTest.uproject”
BTW, my phone is XiaoMi Mi 2s.

4

I have successfully packaged a project for Android and installed it onto our Xiaomi Mi 2S. When you’re installing on the device, you should either install the APK or the BAT file, depending on which way you are trying to install onto the device. Since you said you’ve added the PAK file to the device, you should instead add the APK files to the device and install.

Is [this the documentation][1] you’re using?

Thanks!

Updating Unreal Engine Projects With Patches After Release | Unreal Engine 5.1 Documentation

5

Hey , I mean PAK file went wrong. I installed APK file and it works file. But after I added a box into level, package a PAK file and copy it to sdcard, the error message popped up. Yes, I used that documentation.
Thank you.

6

Hello, ?

7

,

We try to respond to people within 4 days time, some issues do take longer than others. We are looking into what you’ve reported and will get back to you as soon as possible.

Thank you!

8

,

Thank you for your patience.

I’ve been looking over this issue for a couple of days and I’m running into an error where no matter what platform I build my patch for, it results in an error. I have entered a bug UE-35200 for this and hope to have more information soon.

In the meantime, I have found a few posts that I believe may be helpful with resolving the issue you’ve ran in to:

  • [AnswerHub: Failed to Open Descriptor File][1]
  • [AnswerHub: Windows - Failed to Open Descriptor File][2]
  • [AnswerHub: Failing to Open Descriptor File after Packaging][3]

Let me know if you’ve already gotten over this issue. If you did, please let me know what helped.

Thanks!

Failed to open descriptor file error - Programming & Scripting - Epic Developer Community Forums
[2]: Failed to open descriptor file! - Make sure VS is compiled for shipping - Programming & Scripting - Epic Developer Community Forums
[3]: Failed to open descriptor file after packaging - Platform & Builds - Epic Developer Community Forums

9
  • Are you installing 2 pak files?
  • Could you provide more detailed reproduction steps?
  • Do you still have your logs files? If so, upload them.

Thanks!

10

@

Our Developers are investigating this issue further but we need some additional information from you:

  • Are you installing 2 pak files?
  • Could you provide more detailed reproduction steps?
  • Do you still have your logs files? If so, upload them.

Thanks!

11

Hey ,
I installed just 1 pak file.
I reproduced it using third person c++ template and normal patch steps.
Can’t find log files, sorry :frowning:
I’m not working on patch now since my game have’t finished yet.

12

Thank you, I have relayed the information onward.