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**Category:** Platform & Builds\
**Tags:** unreal-engine, question\
**Created:** [May 27, 2015, 12:50pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891 "2015-05-27T12:50:12Z")\
**Posts on this page:** 17\
**Page:** 1
**Author:**  [@iNviSible.yuno](https://forums.unrealengine.com/u/iNviSible.yuno)\
**Post date:** [May 27, 2015, 12:50pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/1 "2015-05-27T12:50:12Z")
Heyo,
After successfully packaging my game for HTML5, I get the error
**Failed to open descriptor file '…/…/…/X/X.uproject**
I am using Firefox Developer Edition 40.0a2 (2015-05-26)
What am I missing ?
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**Author:**  [@iNviSible.yuno](https://forums.unrealengine.com/u/iNviSible.yuno)\
**Post date:** [June 9, 2015, 10:11am UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/2 "2015-06-09T10:11:02Z")
Still Noone? ☹
This is the rest of the error message…
Error: uncaught exception: abort() at jsStackTrace@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:1:18192
stackTrace@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:1:18375
abort@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:174:78449
ZFR@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:165:769509
O0b@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:33:103474
vq@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:77:37320
Qq@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:77:46726
Rq@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:77:47027
callMain@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:174:76754
doRun@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:174:77583
run/\<@file:///Z:/ZDF%20SPORTStudio/UE4%20Builds/HTML5/UE4Game-HTML5-Shipping.js:174:77751
---
**Author:**  [@anonymous\_user\_a08c0bf2](https://forums.unrealengine.com/u/anonymous_user_a08c0bf2)\
**Post date:** [June 9, 2015, 1:47pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/3 "2015-06-09T13:47:52Z")
Hey Invisible ,
Have you attempted to package your HTML5 project and launch it onto any other web browser, such as ? Also, which version of emscripten are you using?
Looking forward to hearing back from you, thanks.
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**Author:**  [@iNviSible.yuno](https://forums.unrealengine.com/u/iNviSible.yuno)\
**Post date:** [June 9, 2015, 6:03pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/4 "2015-06-09T18:03:44Z")
Thanks for the reply:)) I have tried launching it in Firefox, , Firefox Dev and Chrome. I am using emscripten 1.30.0 and python 2.7.5.3\_64bit
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**Author:**  [@anonymous\_user\_a08c0bf2](https://forums.unrealengine.com/u/anonymous_user_a08c0bf2)\
**Post date:** [June 9, 2015, 6:36pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/5 "2015-06-09T18:36:46Z")
Hey ,
I would suggest downgrading your emscripten. There is currently an issue with 1.30.0 and it’s not fixed yet, and isn’t expected to be corrected until 4.9. I know that 1.25.0 and 1.29.0 works. Please try that and let me know how it goes, thank you. 🙂
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**Author:**  [@iNviSible.yuno](https://forums.unrealengine.com/u/iNviSible.yuno)\
**Post date:** [June 10, 2015, 9:44am UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/6 "2015-06-10T09:44:20Z")
Thanks^^ I deinstalled 1.30, installed 1.29 , but the error remains. Why would it even try to open the UProject file, its not part of the build…
edit: Just created a new project (FP BP with starter contend) and build it. It worked. Seems to be a project-specific problem…
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**Author:**  [@iNviSible.yuno](https://forums.unrealengine.com/u/iNviSible.yuno)\
**Post date:** [June 10, 2015, 11:42am UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/7 "2015-06-10T11:42:38Z")
edit2: or not. any build after the first failed to start in the browser. tried to create a new project (FP BP with starter contend) again and this time I couldnt start it. at least this time its a new error message:
Error: uncaught exception: abort() at jsStackTrace@file:///Z:/\_TEMP/HTML5/UE4Game.js:853:12
stackTrace@file:///Z:/\_TEMP/HTML5/UE4Game.js:867:21
abort@file:///Z:/\_TEMP/HTML5/UE4Game.js:5112771:24
b79@file:///Z:/\_TEMP/HTML5/UE4Game.js:5090450:2
\_\_ZN13FOutputDevice4LogfEPKwz [FOutputDevice::Logf(wchar\_t\*, …)]@file:///Z:/\_TEMP/HTML5/UE4Game.js:3255148:2
\_\_ZN6FDebug12AssertFailedEPKcS1\_iPKwz [FDebug::AssertFailed?S(char\*)]@file:///Z:/\_TEMP/HTML5/UE4Game.js:1816589:2
\_\_ZN24FICUInternationalization10InitializeEv [FICUInternationalization::Initialize()]@file:///Z:/\_TEMP/HTML5/UE4Game.js:990222:3
\_\_ZN21FInternationalization10InitializeEv [FInternationalization::Initialize()]@file:///Z:/\_TEMP/HTML5/UE4Game.js:4564468:20
\_\_ZN21FInternationalization3GetEv [FInternationalization::Get()]@file:///Z:/_TEMP/HTML5/UE4Game.js:4231991:2
\_\_ZN5FText14FormatInternalERKS\_RK6TArrayI20FFormatArgumentValue17FDefaultAllocatorEbb [FText::FormatInternal?_(undefined?S?&)]@file:///Z:/\_TEMP/HTML5/UE4Game.js:985615:14
… and so on.
No Idea whats going on here x)
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**Author:**  [@anonymous\_user\_a08c0bf2](https://forums.unrealengine.com/u/anonymous_user_a08c0bf2)\
**Post date:** [June 12, 2015, 8:44pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/8 "2015-06-12T20:44:17Z")
Hey ,
I’m waiting to hear back from our HTML5 developers regarding the errors that you’re receiving. I will let you know as soon as I hear from them.
Thank you for your patience. 🙂
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**Author:**  [@anonymous\_user\_a08c0bf2](https://forums.unrealengine.com/u/anonymous_user_a08c0bf2)\
**Post date:** [June 15, 2015, 2:58pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/9 "2015-06-15T14:58:00Z")
Hey ,
In order to further assist you, we’re going to need your packaged project. Please upload it and provide a link to us either here, or through a private message on the forums.
Thank you!
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**Author:**  [@iNviSible.yuno](https://forums.unrealengine.com/u/iNviSible.yuno)\
**Post date:** [June 16, 2015, 3:26pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/10 "2015-06-16T15:26:44Z")
Alright, thank you. PM is on the way.
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**Author:**  [@iNviSible.yuno](https://forums.unrealengine.com/u/iNviSible.yuno)\
**Post date:** [June 16, 2015, 3:40pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/11 "2015-06-16T15:40:52Z")
Cant really find a PM function when I click on your name, but doesnt matter. Here is the link:
[https://www](https://www)…com/s/qfu8kndi1rw8000/HTML5.zip?dl=0
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**Author:**  [@anonymous\_user\_a08c0bf2](https://forums.unrealengine.com/u/anonymous_user_a08c0bf2)\
**Post date:** [June 16, 2015, 6:05pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/12 "2015-06-16T18:05:27Z")
Hey ,
I have submitted a bug report to our developers. You can reference this bug by referring to: UE-17140
I will update you as soon as I hear back from our developers regarding the bug updates. If you have any further questions, please let us know.
Have a great day!
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**Author:**  [@joshbadams](https://forums.unrealengine.com/u/joshbadams)\
**Post date:** [June 16, 2015, 7:51pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/13 "2015-06-16T19:51:26Z")
Could you go into your project’s Saved/StagedBuilds/HTML5 directory and zip up the contents? The full packaged one is harder to decompose.
Also, I get a different error (it finds the .uproject but then no ICU data files - similar but different).
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**Author:**  [@iNviSible.yuno](https://forums.unrealengine.com/u/iNviSible.yuno)\
**Post date:** [June 17, 2015, 10:38am UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/14 "2015-06-17T10:38:48Z")
I dont get the descriptor file error anymore either (after I made a new project with just the necessary assets).
So its probably the same error for both of us now)) Here is the new link: [https://www](https://www)…com/s/za36y3fno7rz9bm/StagedBuilds.zip?dl=0
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**Author:**  [@anonymous\_user\_a08c0bf2](https://forums.unrealengine.com/u/anonymous_user_a08c0bf2)\
**Post date:** [June 19, 2015, 2:49pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/15 "2015-06-19T14:49:12Z")
Hey ,
Thanks for providing us with that information. I have made sure the report was updated with your link. Please do not take this down at this time.
We will reply back once it’s fixed or if we need more information. 🙂
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**Author:**  [@joshbadams](https://forums.unrealengine.com/u/joshbadams)\
**Post date:** [June 22, 2015, 3:36pm UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/16 "2015-06-22T15:36:48Z")
Well I don’t see anything wrong at first glance. We’ll poke more at it!
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**Author:**  [@anonymous\_user\_d44e7f33](https://forums.unrealengine.com/u/anonymous_user_d44e7f33)\
**Post date:** [March 23, 2018, 4:46am UTC](https://forums.unrealengine.com/t/failed-to-open-descriptor-file-after-html5-build/319891/17 "2018-03-23T04:46:46Z")
Old post, but I’m still running into this exact issue, and I noticed the issue is marked as “Won’t Fix”. Does this mean there’s no ideas on how to solve it?