Using Qt QMetaObject to print a class name

I'm trying to understand Qt's reflection capabilities by testing its QMetaObject class. As a minimum example, I'm trying to see if I can find the name of a class using using QMetaObject. However, upon running the programme, I get a compile time error "undefined reference to 'vtable for ReflectedClass'". I can remove the compile time error by removing the Q_OBJECT macro however then when printing out the class name I get "QObject" which is the parent class and NOT the class Ive defined. I was told I must add in Q_OBJECT to get the class of the child class. Can anyone help me address the error and help me to simply get a class name using QMetaObject. Here is the code:

#include <QCoreApplication>
#include <iostream>
#include <QString>
#include <QObject>
#include <QMetaObject>
#include <QMetaProperty>
#include <QDebug>

using namespace std;

class ReflectedClass : public QObject {
    Q_OBJECT
public:
    int getFieldA(){
        return fieldA;
    }
    bool getFieldB(){
        return fieldB;
    }
    QString getFieldC(){
        return fieldC;
    }
    void setFieldA(int i){
        fieldA = i;
    }
    void setFieldB(bool b){
        fieldB = b;
    }
    void setFieldC(QString s){
        fieldC = s;
    }

private:
    int fieldA;
    bool fieldB;
    QString fieldC;
};

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    ReflectedClass *a = new ReflectedClass();
    a->setFieldA(3);
    a->setFieldB(true);
    a->setFieldC("Hello");
    const QMetaObject *mo = a->metaObject();
    qDebug() << mo->className();
    return app.exec();
}