"Cannot connect (null)::newConnection() to myserver::onNewConnection()" - newConnection signal not called - c++

Question

I tried to run simple client-server app in QT. Problem is with "connect" on server side - newConnection slot isn't executed and exception appears (like in title).
***************myserver.cpp***********
#include "myserver.h"
myserver::myserver(){}
myserver::~myserver(){}
void myserver::startServer()
{
qDebug()<<"Starting startServer()";
tcpServer = new QTcpServer(this);
if (this->listen(QHostAddress::Any,1000))
{
qDebug()<<"Listening";
}
else
{
qDebug()<<"Not listening";
}
}
void myserver::incomingConnection(int socketDescriptor)
{
qDebug()<<"incomingConnection() started";
socket=new QTcpSocket(this);
socket->setSocketDescriptor(socketDescriptor);
connect(tcpServer,SIGNAL(newConnection()),this,SLOT(onNewConnection()));
qDebug()<<socketDescriptor<<"Client connected";
}
void myserver::onNewConnection()
{
qDebug()<<"onNewConnection() started";
}
**********myserver.h**************
#ifndef MYSERVER_H
#define MYSERVER_H
#include <QTcpServer>
#include <QTcpSocket>
class myserver: public QTcpServer
{
Q_OBJECT
public:
myserver();
~myserver();
QTcpSocket* socket;
QTcpServer *tcpServer=nullptr;
public slots:
void startServer();
void incomingConnection(int socketDescriptor);
void onNewConnection();
};
#endif // MYSERVER_H
***********testClient.cpp**************
#include "myclient.h"
#include "ui_myclient.h"
myclient::myclient(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::myclient)
{
ui->setupUi(this);
socket=new QTcpSocket(this);
connect(socket,SIGNAL(connected()),this,SLOT(socketMap()));
}
myclient::~myclient()
{
delete ui;
}
void myclient::on_pushButton_clicked()
{
socket->connectToHost("127.0.0.1",1000);
if(socket->isOpen())
{
qDebug()<<"Connected!";
}
else {
qDebug()<<"Not connected";
}
}
void myclient::socketMap()
{
qDebug()<<"socketMap() started";
}
I expected onNewConnection() being called when client connects. Also I have checked client side and connection is confirmed.
This is console output on server:
Starting startServer()
Listening
incomingConnection() started
948 Client connected