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Unknown module(s) in QT: webenginewidgets

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  • Christian EhrlicherC Offline
    Christian EhrlicherC Offline
    Christian Ehrlicher
    Lifetime Qt Champion
    wrote last edited by
    #6

    You can select single components in the Qt online installer.

    Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
    Visit the Qt Academy at https://academy.qt.io/catalog

    1 Reply Last reply
    0
    • J Offline
      J Offline
      JacobNovitsky
      wrote last edited by
      #7

      webEngine.png
      How should I proceed? I have another machine with Qt installed with online installer

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote last edited by
        #8

        Hi,

        Since you already installed Qt using the online installer, go to the folder and use the Maintenance Tool to modify your installation.

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        1
        • J Offline
          J Offline
          JacobNovitsky
          wrote last edited by
          #9

          it does not work
          Cannot initialize cache: Cannot obtain the lock for file "/home/j/.cache/qt-unified-linux-online/cache.lock": Resource temporarily unavailable

          jsulmJ 1 Reply Last reply
          0
          • C Offline
            C Offline
            ChrisW67
            wrote last edited by
            #10

            As @Christian-Ehrlicher pointed out: if you built your Qt instance from source, then you need to reconfigure it to include the Web Engine components, rebuild, and reinstall.
            If, as @SGaist has assumed, you installed your entire Qt from the online installer, then you need to run the Maintenance Tool, select the missing component(s), and let it install them for you.

            The error message you posted seems to indicate that you are trying to install Qt using the online installer on top of an existing self-built Qt. You cannot add a component to an existing self-built Qt using the Qt Online installer. To install a completely new Qt instance you need to install into a fresh directory.

            1 Reply Last reply
            0
            • J JacobNovitsky

              it does not work
              Cannot initialize cache: Cannot obtain the lock for file "/home/j/.cache/qt-unified-linux-online/cache.lock": Resource temporarily unavailable

              jsulmJ Online
              jsulmJ Online
              jsulm
              Lifetime Qt Champion
              wrote last edited by
              #11

              @JacobNovitsky said in Unknown module(s) in QT: webenginewidgets:

              Cannot obtain the lock for file "/home/j/.cache/qt-unified-linux-online/cache.lock": Resource temporarily unavailable

              Is Qt Online Installer still running? If so close it and try again.
              If it does not help delete that file manually.

              https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • J Offline
                J Offline
                JacobNovitsky
                wrote last edited by JacobNovitsky
                #12

                I've removed all components with Maintenance tool, then reinstalled
                Qt and Web engine with online installer

                Trying to compile sample project:

                QT += widgets webenginewidgets
                CONFIG += c++17
                SOURCES += main.cpp
                
                #include <QApplication>
                #include <QWebEngineView>
                #include <QUrl>
                
                int main(int argc, char *argv[]) {
                    QApplication app(argc, argv);
                
                    QWebEngineView view;
                    view.resize(1200, 800);
                    view.load(QUrl(QStringLiteral("https://www.qt.io")));
                    view.show();
                
                    return app.exec();
                }
                

                getting error:
                :-1: error: Unknown module(s) in QT: webchannel positioning

                Kindly advise!
                q.png

                jsulmJ 1 Reply Last reply
                0
                • J JacobNovitsky

                  I've removed all components with Maintenance tool, then reinstalled
                  Qt and Web engine with online installer

                  Trying to compile sample project:

                  QT += widgets webenginewidgets
                  CONFIG += c++17
                  SOURCES += main.cpp
                  
                  #include <QApplication>
                  #include <QWebEngineView>
                  #include <QUrl>
                  
                  int main(int argc, char *argv[]) {
                      QApplication app(argc, argv);
                  
                      QWebEngineView view;
                      view.resize(1200, 800);
                      view.load(QUrl(QStringLiteral("https://www.qt.io")));
                      view.show();
                  
                      return app.exec();
                  }
                  

                  getting error:
                  :-1: error: Unknown module(s) in QT: webchannel positioning

                  Kindly advise!
                  q.png

                  jsulmJ Online
                  jsulmJ Online
                  jsulm
                  Lifetime Qt Champion
                  wrote last edited by
                  #13

                  @JacobNovitsky said in Unknown module(s) in QT: webenginewidgets:

                  webchannel positioning

                  Same: did you install these two modules?

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  0
                  • J Offline
                    J Offline
                    JacobNovitsky
                    wrote last edited by JacobNovitsky
                    #14

                    libqt6webchannel6/jammy,now 6.2.4-1ubuntu1 amd64 [installed,automatic]
                    libqt6webchannel6-dev/jammy,now 6.2.4-1ubuntu1 amd64 [installed,automatic]
                    1wlibqt6positioning6/jammy,now 6.2.4-1 amd64 [installed,automatic]
                    libqt6positioning6-plugins/jammy,now 6.2.4-1 amd64 [installed,automatic]
                    libqt6positioningquick6/jammy,now 6.2.4-1 amd64 [installed,automatic]
                    qt6-positioning-dev/jammy,now 6.2.4-1 amd64 [installed,automatic]

                    SGaistS 1 Reply Last reply
                    0
                    • J JacobNovitsky

                      libqt6webchannel6/jammy,now 6.2.4-1ubuntu1 amd64 [installed,automatic]
                      libqt6webchannel6-dev/jammy,now 6.2.4-1ubuntu1 amd64 [installed,automatic]
                      1wlibqt6positioning6/jammy,now 6.2.4-1 amd64 [installed,automatic]
                      libqt6positioning6-plugins/jammy,now 6.2.4-1 amd64 [installed,automatic]
                      libqt6positioningquick6/jammy,now 6.2.4-1 amd64 [installed,automatic]
                      qt6-positioning-dev/jammy,now 6.2.4-1 amd64 [installed,automatic]

                      SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote last edited by
                      #15

                      @JacobNovitsky If you are using the Qt version from the online installer, you have to add these dependencies from the online installer as well...

                      Or just use the Qt version from your distribution. However you cannot mix and match.

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                      1 Reply Last reply
                      1
                      • J Offline
                        J Offline
                        JacobNovitsky
                        wrote last edited by
                        #16

                        Should I install above libraries with version 6.9.2? (as per my Qt version)

                        jsulmJ 1 Reply Last reply
                        0
                        • J JacobNovitsky

                          Should I install above libraries with version 6.9.2? (as per my Qt version)

                          jsulmJ Online
                          jsulmJ Online
                          jsulm
                          Lifetime Qt Champion
                          wrote last edited by
                          #17

                          @JacobNovitsky You should install these libraries for the Qt version you're using.
                          You wrote:
                          "I've removed all components with Maintenance tool, then reinstalled
                          Qt and Web engine with online installer"
                          Doesn't that mean that you now need to install these modules using Qt Maintenance Tool from that Qt installation?

                          https://forum.qt.io/topic/113070/qt-code-of-conduct

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                          0
                          • AsifBahrainwalaA Offline
                            AsifBahrainwalaA Offline
                            AsifBahrainwala
                            wrote last edited by AsifBahrainwala
                            #18
                            This post is deleted!
                            1 Reply Last reply
                            0
                            • J Offline
                              J Offline
                              JacobNovitsky
                              wrote last edited by JacobNovitsky
                              #19

                              All modules installed, version of module is the same as Qt -> 6.9.2
                              getting error when trying to build below:

                              :-1: error: Project ERROR: Unknown module(s) in QT: webchannel positioning

                              TEMPLATE = app
                              TARGET = webengine_test
                              QT += core gui widgets webenginewidgets   # <-- webenginewidgets is required
                              
                              CONFIG += c++17
                              
                              SOURCES += main.cpp
                              
                              #include <QApplication>
                              #include <QWebEngineView>
                              
                              int main(int argc, char *argv[])
                              {
                                  QApplication app(argc, argv);
                              
                                  QWebEngineView view;
                                  view.resize(800, 600);
                                  view.load(QUrl("https://www.qt.io")); // any test URL
                                  view.show();
                              
                                  return app.exec();
                              }
                              
                              SGaistS 1 Reply Last reply
                              0
                              • hskoglundH Offline
                                hskoglundH Offline
                                hskoglund
                                wrote last edited by
                                #20

                                Screenshot from 2025-09-20 06-46-18.png

                                1 Reply Last reply
                                0
                                • J JacobNovitsky

                                  All modules installed, version of module is the same as Qt -> 6.9.2
                                  getting error when trying to build below:

                                  :-1: error: Project ERROR: Unknown module(s) in QT: webchannel positioning

                                  TEMPLATE = app
                                  TARGET = webengine_test
                                  QT += core gui widgets webenginewidgets   # <-- webenginewidgets is required
                                  
                                  CONFIG += c++17
                                  
                                  SOURCES += main.cpp
                                  
                                  #include <QApplication>
                                  #include <QWebEngineView>
                                  
                                  int main(int argc, char *argv[])
                                  {
                                      QApplication app(argc, argv);
                                  
                                      QWebEngineView view;
                                      view.resize(800, 600);
                                      view.load(QUrl("https://www.qt.io")); // any test URL
                                      view.show();
                                  
                                      return app.exec();
                                  }
                                  
                                  SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote last edited by
                                  #21

                                  @JacobNovitsky when you say all modules installed:

                                  • from the same source ?
                                  • are you using the Qt version with all the modules installed to build your application ?

                                  Interested in AI ? www.idiap.ch
                                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                  0
                                  • S Offline
                                    S Offline
                                    SMITH Q
                                    Banned
                                    wrote last edited by
                                    #22
                                    This post is deleted!
                                    1 Reply Last reply
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