QtCreator errors with QtGraphs QML

[Tobias83]

@SGaist The QtCreator says "unknown component". And the runtime error is
QQmlApplicationEngine failed to load component
qrc:/qt_qml/Main.qml:53:13: LineSeries is not a type

Tobias

[SGaist]

Can you share a minimal compilable example that shows this ?

[Tobias83]

@SGaist If I can say this: I think its not a problem with my code. I think there is some software package for QtGraphs missing. In comparism with QtCharts, there is no

• libQt6GraphsQml6 -> /usr/lib64/
• qt6-graphsqml-devel -> /usr/include/qt6/QtGraphsQml/

When I tried to use QtCharts before, the remaining prompts were also not found by QtCreator, before I installed the corresponding devel packages from the repo ...

Tobias

[JoeCFD]

@Tobias83 said in QtCreator errors with QtGraphs QML:

LineSeries

do you have
import QtCharts 2.8
in Main.qml?
https://doc.qt.io/qt-6/qml-qtcharts-lineseries.html

[SGaist]

@Tobias83 I just realized you have 6.7. Qt Graphs went out of tech preview with 6.8.

[Tobias83]

@JoeCFD I have

import QtGraphs 2.12

[Tobias83]

@SGaist said in QtCreator errors with QtGraphs QML:

Graphs went out of tech preview with 6.8

What does that mean?

On my Computer I have libQt6Core6 6.8.2-3.2. I thought the libs are downward compatible. Should I change

find_package(Qt6 6.7 REQUIRED COMPONENTS Qml Core Quick Graphs)

With changing in

find_package(Qt6 6.8 REQUIRED COMPONENTS Qml Core Quick Graphs)

there is no change.

Tobias

[SGaist]

How did you install Qt ?
Which packages do you have ?

[Tobias83]

@SGaist I think its not up to Qt, because QtCharts worked for me. But maybe there is a devel package for qml needed as I wrote ...

[SGaist]

That's why I am asking how you installed Qt.

[Tobias83]

@SGaist I have installed Qt via system installation, because I have OpenSuse Tumbleweed with KDE Plasma as OS. The packages are updated via the official repositories of OpenSuse. Qt Creator is also installed via the repos.

[SGaist]

Are you able to build and run any of the Qt Graphs examples ?

[Tobias83]

@SGaist OK, the hellographs example is working: hellographs on https://code.qt.io
I tried to make the same cmakelists.txt, but I don't know, whats the difference between my project and hellographs. There are some warnings in QtCreator like:
qabstractaxis.h:17: Warnung: Multiple C++ types called QAbstractAxis found!

or

/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:792:EVAL:1: Warnung:
Call-Stack:
/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:792:EVAL:1 (qt6_finalize_target)
/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:823 (_qt_internal_finalize_executable)
/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:745 (cmake_language)
/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:745 (qt6_import_qml_plugins)
/home/tobias/Git-dev/HardCore/CMakeLists.txt:72 (qt_add_qml_module)
/usr/lib64/cmake/Qt6Qml/Qt6QmlMacros.cmake:1241 (qt6_add_qml_module)
/usr/lib64/cmake/Qt6Qml/Qt6QmlMacros.cmake:708 (__qt_internal_setup_policy)
/usr/lib64/cmake/Qt6Qml/Qt6QmlMacros.cmake:4216 (message)

or

/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:792:EVAL:1: Warnung: The qml plugin 'qmlplugin' is a dependency of 'simHardcoreQt6', but the
link target it defines (Qt6::qmlplugin) does not exist in the current
scope. The plugin will not be linked.
Call-Stack:
/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:792:EVAL:1 (qt6_finalize_target)
/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:823 (_qt_internal_finalize_executable)
/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:745 (cmake_language)
/usr/lib64/cmake/Qt6Core/Qt6CoreMacros.cmake:745 (qt6_import_qml_plugins)
/usr/lib64/cmake/Qt6Qml/Qt6QmlMacros.cmake:4216 (message)

[SGaist]

Are you trying to use both Qt Graphs and Qt Charts at the same time ?

[Tobias83]

@SGaist If I remove all the QtCharts promts in CMakeLists.txt and Main.qml, the error remains.

[SGaist]

Did you nuke the build folder after these changes to ensure you start from a clean state ?

[Tobias83]

@SGaist I moved the build directory:

mv build-HardCore-Desktop-Debug/ build-HardCore-Desktop-Debug_old/

Than I executed cmake file again, but I can't build the project and the project is not structered anymore. There is only a file list at the left site. The error in German language is:
:-1: Fehler: CMake-Konfiguration "Debug wurde nicht gefunden. Verfügbare Konfigurationen: "".
Stellen Sie sicher, dass der Wert der CMAKE_BUILD_TYPE-Variable derselbe wie der des "Build-Typ"-Felds ist.

... cmake configuration Debug was not found. Ensure that the variable value CMAKE_BUILD_TYPE is the same as that of the Build Type area.

[jsulm]

@Tobias83 Did you try to build in release mode?

[Tobias83]

@jsulm In release mode, there is also the error unknown component for the QtGraphs prompts.

[SGaist]

Even if it was already done once:

• Exit Qt Creator
• Delete the CMakeLists.txt.user file from your sources
• Nuke all build folders
• Start Qt Creator and reconfigure your project