how to include QThread for main form

[narlapavan]

#ifndef FRMFIND_H
#define FRMFIND_H
 
#include <QMainWindow>
#include<QThread>
 
namespace Ui {
    class frmFind;
}
 
class frmFind : public QMainWindow, QThread
{
    Q_OBJECT
 
public:
    explicit frmFind(QWidget *parent = 0);
  //  void run();
    void QThread::run();
    ~frmFind();
public slots:
    void getDirNames();
private slots:
    void on_btnSearch_clicked();
 
private:
    Ui::frmFind *ui;
};
 
#endif // FRMFIND_H

#ifndef FRMFIND_H
#define FRMFIND_H

#include <QMainWindow>
#include<QThread>

namespace Ui {
    class frmFind;
}

class frmFind : public QMainWindow, QThread
{
    Q_OBJECT

public:
    explicit frmFind(QWidget *parent = 0);
  //  void run();
    void QThread::run();
    ~frmFind();
public slots:
    void getDirNames();
private slots:
    void on_btnSearch_clicked();

private:
    Ui::frmFind *ui;
};

#endif // FRMFIND_H

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when i am including QThread in above way for main Form , it giving this error
ERROR:
/PATHNAME/moc_frmfind.cpp:55: error: ‘QObject’ is an ambiguous base of ‘frmFind’