QtCharts module not found even after installing in Qt Maintenance
Solution 1:
It seems you have only installed Qtcharts in the Additional libraries section.I know it's showing 0mb installation which is useless.
Select the QT section which is below the additional libraries section. Then select the version you have installed. Under the selected version there is a QT charts module, select it and install that.
Then go to your project and run a 'qmake'. Now you can observe all the errors are gone.