How can I connect to FTP server in QT - c++

Question

I am trying to connect to a FTP server but I got the following issue :
QObject::connect: No such slot Object::replyFinished
in ...\ here my program name ......
Where is my mistake? I suppose it is in the following code :
///////////////Connection.h file////////
class Connection : public QObject
{
public:
explicit Connection(QObject *parent=0);
Connection(QString uri, QString usernmae, QString password);
void FTP_Connection();
public slots:
void replyFinished(QNetworkReply *);
private:
QString URI;
QString USERNAME;
QString PASSWORD;
QNetworkAccessManager *manager;
};
///////////////Connection.cpp file////////
Connection::Connection(QString uri, QString usernmae, QString password)
{
this->URI=uri;
this->USERNAME=usernmae;
this->PASSWORD=password;
}
void Connection::FTP_Connection()
{
QUrl url(this->URI);
url.setUserName(this->USERNAME);
url.setPassword(this->PASSWORD);
url.setPort(21);
QNetworkRequest request(url);
manager=new QNetworkAccessManager(this);
connect(manager,
SIGNAL(finished(QNetworkReply*)),
this,
SLOT(replyFinished(QNetworkReply *)));
manager->get(request);
}
///////////////main.cpp file////////
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
Connection *con=new Connection("ftp://192.168.3.62//",
"win7",
"053253");
con->FTP_Connection();
return a.exec();
}