Ошибка No such slot при гет запросе Qt

requests.h

#ifndef REQUESTS_H
#define REQUESTS_H
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkReply>
class Req : public QObject{
public:
    QNetworkAccessManager *manager;
    QNetworkRequest request;
    QNetworkReply *reply;
    sendGet(QString Url);
private slots:
    void getReplyFinished(QNetworkReply *reply);
};
#endif // REQUESTS_H

requests.cpp

#include "requests.h"
#include <QTextCodec>
#include <QString>
#include <QObject>
#include <QTextCodec>
#include <QString>
#include <QMessageBox>
void Req::sendGet(QString Url)
{   manager = new QNetworkAccessManager();
    QNetworkRequest request;
    request.setUrl(Url);
    //user-agent
    request.setUrl(Url);
    request.setRawHeader("Authorization:", " OAuth AQAAAAAJlF7xAADLW8Sf6NXX-0ugtcoEeY_6dyM");
    request.setRawHeader("Content-Type", "application/json");
    request.setRawHeader("Accept", "application/json");
    reply = manager->get(request);//Получаем данные с сервера
    QObject::connect (
    manager, SIGNAL(finished(QNetworkReply*)),
        this,   SLOT(getReplyFinished(QNetworkReply*))
    );
}
void Req::getReplyFinished(QNetworkReply *reply)
{   qDebug()<<"Task finished";
    QTextCodec* defaultTextCodec = QTextCodec::codecForName("Windows-1251");//Нужная нам кодировка
    QTextDecoder *decoder = new QTextDecoder(defaultTextCodec);
    QString HTML = decoder->toUnicode(reply->readAll());
    reply->deleteLater();
}

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "requests.h"
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::on_pushButton_clicked()
{
    Req req;
    req.sendGet("https://cloud-api.yandex.net/v1/disk/");
}

При нажатии на кнопку получаю:

QObject::connect: No such slot QObject::getReplyFinished(QNetworkReply*) in ..\secured_yad\requests.cpp:21
qt.network.ssl: QSslSocket: cannot call unresolved function SSLv23_client_method
qt.network.ssl: QSslSocket: cannot call unresolved function SSL_CTX_new
qt.network.ssl: QSslSocket: cannot call unresolved function SSL_library_init
qt.network.ssl: QSslSocket: cannot call unresolved function ERR_get_error
qt.network.ssl: QSslSocket: cannot call unresolved function ERR_get_error

Пытался сделать как сказано здесь: https://stackoverflow.com/questions/29211085/qt-no-such-slot-qobjectslotnameqnetworkreply , но видно сделал не верно.