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Copied some example code but getting an error

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I knew I am asking too many questions today but I promise this is the last one. I got the calculator code from here [trinitydesktop.org] and made a project and put .js and .ui file in to that directory and copied main.cpp and qrc files But in main.cpp some includes could not be found so I changed from : then and there is no warning they are found or not  #include <QApplication>  #include <QUiLoader>  #include <QtScript>  #include <QWidget>  #include <QFile>  #include <QMainWindow>  #include <QLineEdit>    #ifndef QT_NO_SCRIPTTOOLS  #include <QScriptEngineDebugger>  #endif to :  #include <QApplication>  #include <QtUiTools/QUiLoader>  #include <QtScript/QtScript>  #include <QWidget>  #include <QFile>  #include <QMainWindow>  #include <QLineEdit>      #ifndef QT_NO_SCRIPTTOOLS  #include <QtScriptTools/QScriptEngineDebugger>  #endif But I when I try to run it , I get this error ; I don’t what does it mean. D:\qt\owo\main.cpp:45: error: C2065: 'qFindChild' : undeclared identifier   D:\qt\owo\main.cpp:45: error: C2059: syntax error : '>' also here [s10.postimg.org] the screen shot

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