Can someone help with this error?

server.h file...

#ifndef SERVER_H
#define SERVER_H
#include <QDialog>
#include <QtSql>
//#include <QtDebug>
#include <QtGui/QApplication>
#include "server.h"

namespace Ui {
class server;
}

class server: public QMainWindow
{
Q_OBJECT

public:
explicit server(QWidget *parent = 0);
~server();

private:
Ui::server *ui;

private slots:
void showcandidates();
void showballots();
void showvoters();
};

#endif


server.cpp file...

#include <QTableView>
//#include <QtDebug>
#include <QtSql>
#include "server.h"
#include "ui_server.h"
#include <QApplication>





server::server(QWidget *parent) :
QMainWindow(parent);
ui(new Ui::server)