[SOLVED] Qt - This application failed to start because it could not find or load the qt platform plugin windows

valeSimu

When I want to run my qt application, I encounter this error by Microsoft Visual C++ Debug Library:

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

By following some existing post like for example "this":http://stackoverflow.com/questions/20495620/qt-5-1-1-application-failed-to-start-because-platform-plugin-windows-is-missi I found out that it was missing libEGL.dll, and I added it but I have still the same error.

I am using Qt 5.2.1 and MSVC2010 32bit. What other information do you need? Do you have any idea of how to solve this problem? Thank you in advance!

sierdzio

Please follow "the deployment guide.":http://qt-project.org/doc/qt-5/windows-deployment.html

valeSimu

Thank you! Sorry but I am quite new with qt and coding with windows...Would you mind to tell me which section to follow of the link you gave me, please?

sierdzio

For shared libs. "Link":http://qt-project.org/doc/qt-5/windows-deployment.html#shared-libraries.

For simple running of your app during day-to-day development, you can simply use Qt Creator: it will run your app without doing any deployment.

valeSimu

In fact, I am not deploying for the moment, I am developping... I am using Qt Creator actually which shows me this error....

I am using msvc10, I have to use msvcr100.dll right? Donno if is this the issue...I have msvcr90.dll at the moment

hskoglund

Hi, Qt Creator itself is built using MSVC2010 32bit, since your Qt Creator works your msvcr100.dll should be alright.

Try building a new, empty Qt Widgets app, do you still get that platform plugin error when your start it from Qt Creator?

valeSimu

new project without ogre, it works, no error!

hskoglund

Good news! But what about your old project with the platform plugin error, is that also Qt Widget flavored? Perhaps with an older Qt version?

valeSimu

In the old project, Ogre is a widget or plugin I think (I didn't code it!)...the error is still there :-(

hskoglund

Googled the Ogre, it's a 3d graphics plugin for Qt4 but now you are on Qt5 :-(
Here's some google'd info "on how to upgrade to Qt5":http://advancingusability.wordpress.com/2013/03/30/how-to-integrate-ogre3d-into-a-qt5-qml-scene/

sierdzio

hskoglund that is some impressive troubleshooting you have done there! Congratulations! :-)

valeSimu

The one who coded the project, used the same environment that I have...

hskoglund

sierdzio Thanks, Qt is good stuff. I remember when I started with Qt last year, posted my first question here (-IGL in Ubuntu 12.10) and you answered and helped me.

valeSimu hmmm, if he had the same environment, did he have the same platform plugin error? Or perhaps the environment got upgraded?

valeSimu

He doesn t have errors and I don't think the environment got upgraded...or maybe I can verify...do you know how?

hskoglund

Hi, does he also have Qt 5.2.1 and MSVC2010 32bit? If so, maybe he also have Qt4 installed...

valeSimu

we have exactely the same environmnet

Qt Creator 3.0.1
Qt 5.2.1
MSVC 2010 32 bit

JKSH

[quote author="valeSimu" date="1398410124"]we have exactely the same environmnet

Qt Creator 3.0.1
Qt 5.2.1
MSVC 2010 32 bit[/quote]Hi,

I think you are only looking at the version of Qt that is used to build the Qt Creator IDE. This is not the version of Qt used to build your projects.

You want to look in Tools -> Options... -> Build & Run -> Kits

valeSimu

I solved the problem by folowing this link:

http://falsinsoft.blogspot.ch/2013/09/qt-5-and-failed-to-load-platform-plugin.html

Thank you to everyone!