I am getting this getting this error that " QTNetwork , No such file or Directory"

I took this code dierctly from fortune example, created a new project.
can anyone explain what went wrong

Qt Code: 
  1. #include <QtGui>
  2. #include <QtNetwork>
  3.  
  4. #include <stdlib.h>
  5.  
  6. #include "server.h"
  7.  
  8. server::server(QWidget *parent)
  9. :   QDialog(parent), tcpServer(0), networkSession(0)
  10. {
  11.     statusLabel = new QLabel;
  12.     quitButton = new QPushButton(tr("Quit"));
  13.     quitButton->setAutoDefault(false);
  14.  
  15.  
  16.     QNetworkConfigurationManager manager;
  17.     if (manager.capabilities() & QNetworkConfigurationManager::NetworkSessionRequired) {
  18.         // Get saved network configuration
  19.         QSettings settings(QSettings::UserScope, QLatin1String("Trolltech"));
  20.         settings.beginGroup(QLatin1String("QtNetwork"));
  21.         const QString id = settings.value(QLatin1String("DefaultNetworkConfiguration")).toString();
  22.         settings.endGroup();
  23.  
  24.         // If the saved network configuration is not currently discovered use the system default
  25.         QNetworkConfiguration config = manager.configurationFromIdentifier(id);
  26.         if ((config.state() & QNetworkConfiguration::Discovered) !=
  27.             QNetworkConfiguration::Discovered) {
  28.             config = manager.defaultConfiguration();
  29.         }
  30.  
  31.         networkSession = new QNetworkSession(config, this);
  32.         connect(networkSession, SIGNAL(opened()), this, SLOT(sessionOpened()));
  33.  
  34.         statusLabel->setText(tr("Opening network session."));
  35.         networkSession->open();
  36.     } else {
  37.         sessionOpened();
  38.     }
  39.  
  40.     //! [2]
  41.         fortunes << tr("You've been leading a dog's life. Stay off the furniture.")
  42.                  << tr("You've got to think about tomorrow.")
  43.                  << tr("You will be surprised by a loud noise.")
  44.                  << tr("You will feel hungry again in another hour.")
  45.                  << tr("You might have mail.")
  46.                  << tr("You cannot kill time without injuring eternity.")
  47.                  << tr("Computers are not intelligent. They only think they are.");
  48.     //! [2]
  49.  
  50.         connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
  51.     //! [3]
  52.         connect(tcpServer, SIGNAL(newConnection()), this, SLOT(sendFortune()));
  53.     //! [3]
  54.  
  55.         QHBoxLayout *buttonLayout = new QHBoxLayout;
  56.         buttonLayout->addStretch(1);
  57.         buttonLayout->addWidget(quitButton);
  58.         buttonLayout->addStretch(1);
  59.  
  60.         QVBoxLayout *mainLayout = new QVBoxLayout;
  61.         mainLayout->addWidget(statusLabel);
  62.         mainLayout->addLayout(buttonLayout);
  63.         setLayout(mainLayout);
  64.  
  65.         setWindowTitle(tr("Fortune Server"));
  66. }
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Header is:::


Qt Code: 
  1. #ifndef SERVER_H
  2. #define SERVER_H
  3.  
  4. #include <QDialog>
  5. QT_BEGIN_NAMESPACE
  6. class QLabel;
  8. class QTcpServer;
  9. class QNetworkSession;
  10. QT_END_NAMESPACE
  11.  
  12.  
  13. class server : public QDialog
  14. {
  15.     Q_OBJECT
  16.  
  17. public:
  18.      server(QWidget *parent = 0);
  19.  
  20.  
  21. private:
  22.     void sessionOpened();
  23.     void sendFortune();
  24.     QLabel *statusLabel;
  25.     QPushButton *quitButton;
  26.     QTcpServer *tcpServer;
  27.     QStringList fortunes;
  28.     QNetworkSession *networkSession;
  29.  
  30. };
  31.  
  32. #endif // SERVER_H
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