How to fix "QtCharts" library file not found/can't include <QtCharts>? [duplicate]

Question

I'm new to Qt GUI/Widget Application and I am trying to make a simple bar chart. I tried to copy the exact same code that QT provides in their website, [link]: https://doc-snapshots.qt.io/qt5-5.11/qtcharts-barchart-example.html#creating-bar-charts. However, I keep getting a lot of error message that says "QtCharts" file not found and "QBarSet" "QLegend" not found, basically every library that was included was not found.

I saw some troubleshoot page in QT website, it says that I have to add some import statement in my .qml file. But I can't seem to find where is the .qml file located? [link]: https://doc.qt.io/qt-5/qtcharts-index.html

My code looks exactly like this:

//main.cpp
----------
[link]: https://doc-snapshots.qt.io/qt5-5.11/qtcharts-barchart-main-cpp.html

//.pro file
------------
QT       += core gui charts
//I only add "charts" in the above line from the original .pro file
//everything else is the exact same .pro file as in the original.

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = testing_file
TEMPLATE = app
DEFINES += QT_DEPRECATED_WARNINGS
SOURCES += \
        main.cpp \
        mainwindow.cpp

HEADERS += \
        mainwindow.h

FORMS += \
        mainwindow.ui

How do you fix/make the code works? I really have no idea how to fix the error messages. Thanks!

Answer 1

I just realized I did not install the components/submodule of QT Charts, as mentioned by eyllanesc. I had to reinstall the QT all over again and enable the QT Charts components. You can add it with QT Maintenence tool but I didn't have it so I just reinstall it again because I still got the installer.

Reference: How to include the QtCharts library in Qt Creator 4.2.0 (Community)