Qt platform plugin "windows" is not found on one computer

Question

I have an application built with Qt 5.5, deployed and running on x86 Windows 7 with dynamic linking. When I try to launch it on that particular computer, I get the following error:

This application failed to start because it could not find or load the Qt platform plugin "windows".

Available platform plugins are: minimal, offscreen, windows, windows.

Reinstalling the application may fix the problem.

The "windows" plugin is indeed repeated twice in the list.

Though I have the libraries set up properly, such that they run without an issue on my main computer, here, the platforms directory doesn't seem to be found.

File list:

MyProject\platforms\qwindows.dll
MyProject\Qt5Core.dll
MyProject\Qt5Cored.dll
MyProject\Qt5Gui.dll
MyProject\Qt5Guid.dll
MyProject\Qt5Widgets.dll
MyProject\Qt5Widgetsd.dll
MyProject\MyProject.exe

Many similar questions can be found about this error, but I have tried all the answers I have found about it (including changing file and folder names, adding various extra Qt libraries to the directory, etc.) without success. I have built the application again while making sure that all components have the right architecture, again without success.

Other than static linking, how can I make it run?

Burich: thank you, it worked; I am not sure which library was missing, but I feel silly for not thinking of using it before. If you will submit an answer with the details, I will approve it. — Demat, Jan 22 '16 at 14:59
Possible duplicate of [How to deploy a Qt application on Windows?](http://stackoverflow.com/questions/622418/how-to-deploy-a-qt-application-on-windows) — MrEricSir, Jan 22 '16 at 19:23

Vladimir Bershov · Answer 1 · 2016-01-22T14:51:56.690

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You need to put the folder 'platforms' from the \$QTDIR\$version\$complier\plugins\ (which must contains the files qwindows.dll and qminimal.dll) near your .exe file.

Usual list of dlls for Qt 5 on Windows:

edited Jan 22 '16 at 14:51

answered Jan 22 '16 at 14:33

Vladimir Bershov

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He has the "qwindows.dll" in the "platforms" folder which should be correct, or what do mean with "near your .exe file"? For what would you need the "qminimal.dll" ? – Mailerdaimon Jan 22 '16 at 14:45
Folder **platforms** must be near your .exe file – Vladimir Bershov Jan 22 '16 at 14:50
Does your app folder contain all icuxx.dll ?. Does your **platforms** folder contain *qminimal.dll* ? – Vladimir Bershov Jan 22 '16 at 14:53

score 0 · Accepted Answer · answered Jan 22 '16 at 15:00

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Try to use windeployqt. It'll try to autocollect all needed libraries.

answered Jan 22 '16 at 15:00

`windeployqt \MyProject.exe` fixed it. – Demat Jan 22 '16 at 15:04

score 0 · Answer 3 · edited May 23 '17 at 11:53

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Setting the QT_QPA_PLATFORM_PLUGIN_PATH environment variable worked for me.

This solution was also mentioned here and here.

edited May 23 '17 at 11:53

Community

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answered Oct 30 '16 at 12:51

Jim G.

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score 0 · Answer 4 · edited Nov 03 '18 at 06:01

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Open Cmd and write this for qtquick deployment (remove --qmldir for non qtquick):

 windeployqt --qmldir <path-to-app-qml-files> <path-to-app-binary>

For example:

windeployqt --qmldir C:\Users\Administrator\Documents\Dyn
amicView C:\Users\Administrator\Documents\build-DynamicView-vc-Release\release

Write windeployqt for more details.

edited Nov 03 '18 at 06:01

Unheilig

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answered Nov 03 '18 at 05:43

Mahdi Khalili

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Qt platform plugin "windows" is not found on one computer

4 Answers4