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Unknown module(s) in QT: webenginewidgets

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  • 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

    1 Reply Last reply
    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 Offline
          jsulmJ Offline
          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

          1 Reply Last reply
          0
          • 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 Offline
              jsulmJ Offline
              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

              1 Reply Last reply
              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 Offline
                      jsulmJ Offline
                      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

                      1 Reply Last reply
                      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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