# Could not find WebEngineProcess.exe

**URL:** <https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035>\
**Category:** Support\
**Created:** [April 12, 2021, 6:35am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035 "2021-04-12T06:35:24Z")\
**Posts on this page:** 13\
**Page:** 1

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**Author:** ![wujie](https://avatars.discourse-cdn.com/v4/letter/w/dbc845/32.png) [@wujie](https://discourse.slicer.org/u/wujie)\
**Post date:** [April 12, 2021, 6:35am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/1 "2021-04-12T06:35:24Z")

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when I debug the Slicer programe,and run the extension manager,make a error “Could not find QtWebEngineProcess.exe”，how can I address it?

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**Author:** ![wujie](https://avatars.discourse-cdn.com/v4/letter/w/dbc845/32.png) [@wujie](https://discourse.slicer.org/u/wujie)\
**Post date:** [April 12, 2021, 6:58am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/2 "2021-04-12T06:58:15Z")

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I compile slicer using windows.

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [April 12, 2021, 11:33pm UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/3 "2021-04-12T23:33:15Z")

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On my windows machine I’m not seeing a `QtWebEngineProcess.exe` bundled with Qt, but it does appear in a PySide2 folder. Did you compile Slicer with PySide2? I didn’t know that was possible.

In any case installing extensions from the extension manager in your local build is not a supported use case since most C++ libraries won’t work across builds. But pure python ones would I guess.

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**Author:** ![wujie](https://avatars.discourse-cdn.com/v4/letter/w/dbc845/32.png) [@wujie](https://discourse.slicer.org/u/wujie)\
**Post date:** [April 13, 2021, 1:47am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/4 "2021-04-13T01:47:39Z")

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Thank you for replying me,I used the official tutorial to local building.I can’t use PySide2 compiling Slicer

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**Author:** ![wujie](https://avatars.discourse-cdn.com/v4/letter/w/dbc845/32.png) [@wujie](https://discourse.slicer.org/u/wujie)\
**Post date:** [April 13, 2021, 1:48am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/5 "2021-04-13T01:48:06Z")

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> [@wujie](#):
>
> 感谢您的回复，我使用的是本地建筑的官方教程。我无法使用PySide2编译Slicer

> [@wujie](#):
>
> Thank you for replying me,I used the official tutorial to local building.I can’t use PySide2 compiling Slicer

Thank you for replying me,I used the official tutorial to local building.I can’t use PySide2 compiling Slicer

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [April 13, 2021, 2:12am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/6 "2021-04-13T02:12:01Z")

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I have a QtWebEngineProcess.exe in both my Qt binary installations on Windows and also in my installed Slicer’s bin directory.

Did you select to install the Qt QWebEngine component when installing Qt?  
From [Windows — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/developer_guide/build_instructions/windows.html#install-prerequisites)

> [Qt5](https://www.qt.io/download-open-source): Download Qt universal installer and install Qt 5.15 components: MSVC2019 64-bit, Qt Script, Qt WebEngine.

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**Author:** ![wujie](https://avatars.discourse-cdn.com/v4/letter/w/dbc845/32.png) [@wujie](https://discourse.slicer.org/u/wujie)\
**Post date:** [April 13, 2021, 7:55am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/7 "2021-04-13T07:55:53Z")

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Thank you for your reply, I had installed the Qt QWebEngine componet when installing Qt,and I also have a QtWebEngineProcess.exe in both my Qt binary installations on Windows and in Slicer’s bin directory,but I still have the error “Could not find QtWebEngineProcess.exe”,it may exists the problem of version?

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [April 13, 2021, 11:26am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/8 "2021-04-13T11:26:44Z")

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Did your Slicer build finish with errors?

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**Author:** ![smallvalthoss](https://avatars.discourse-cdn.com/v4/letter/s/848f3c/32.png) [@smallvalthoss](https://discourse.slicer.org/u/smallvalthoss)\
**Post date:** [April 24, 2021, 11:02pm UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/9 "2021-04-24T23:02:45Z")

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@jamesobutler I am having trouble figuring out how to download Qt5 to be able to build slicer. Do you still need to download from the online installer? I have tried both and am unable to find anything like “\Qt\5.15.0\msvc2019\_64\lib\cmake\Qt5”. Any help would be appreciated.

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [April 24, 2021, 11:16pm UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/10 "2021-04-24T23:16:07Z")

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Yes, I use Qt 5.15.2. You can download the installer tool from [Download Qt: Get Qt Online Installer](https://www.qt.io/download-qt-installer).

You can read the Slicer build pre-reqs over at [Windows — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/developer_guide/build_instructions/windows.html#install-prerequisites).

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**Author:** ![smallvalthoss](https://avatars.discourse-cdn.com/v4/letter/s/848f3c/32.png) [@smallvalthoss](https://discourse.slicer.org/u/smallvalthoss)\
**Post date:** [April 25, 2021, 12:11am UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/11 "2021-04-25T00:11:44Z")

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Hey thank you, for some reason I kept going around in circles on their site… I appreciate it!

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**Author:** ![smallvalthoss](https://avatars.discourse-cdn.com/v4/letter/s/848f3c/32.png) [@smallvalthoss](https://discourse.slicer.org/u/smallvalthoss)\
**Post date:** [April 25, 2021, 6:52pm UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/12 "2021-04-25T18:52:20Z")

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> [@jamesobutler](#):
>
> Yes, I use Qt 5.15.2. You can download the installer tool from [Download Qt: Get Qt Online Installer](https://www.qt.io/download-qt-installer).
> 
> You can read the Slicer build pre-reqs over at [Windows — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/developer_guide/build_instructions/windows.html#install-prerequisites).

How long does it usually take for you to build the app?

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<div class="post-metadata">

**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 25, 2021, 9:56pm UTC](https://discourse.slicer.org/t/could-not-find-webengineprocess-exe/17035/13 "2021-04-25T21:56:27Z")

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In Windows, a full build takes about 6 hours on a desktop, 12 hours on a laptop.