Runtime Error: could not start server - c++

Question

I wrote a client server program in Qt that client send some message to server but during compile the "startserver" function can't run and i get the following error:could not start server. Could you please say where is problem?
"main.cpp"
#include <QApplication>
#include "mythread.h"
#include "myserver.h"
#include "QtSql/QtSql"
#include "QMessageBox"
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
myserver server;
server.startserver();
MainWindow w;
w.show();
return a.exec();
}
"myserver.h"
#ifndef MYSERVER_H
#define MYSERVER_H
#include <QMainWindow>
#include "QTcpServer"
#include "mythread.h"
#include "QTcpSocket"
namespace Ui
{
class myserver;
}
class myserver : public QObject
{
Q_OBJECT
public:
server(QObject * parent = 0);
explicit myserver(QObject *parent = 0);
void startserver();
public slots:
void acceptConnection();
protected:
void incomingConnections(qintptr socketDescriptor);
QTcpSocket* c_client;
QTcpServer s_server;
private:
qintptr socketDescriptor;
};
#endif
"myserver.cpp"
#include "myserver.h"
#include "mythread.h"
myserver::myserver(QObject *parent) :
QObject(parent)
{
}
void myserver::startserver()
{
int port = 1234;
if(s_server.listen(QHostAddress::Any, port))
{
qDebug() << "Could not start server";
}
else
{
qDebug() << "Listening to port " ;
}
}
void myserver::incomingConnections(qintptr socketDescriptor)
{
mythread *thread = new mythread(socketDescriptor,this);
qDebug() << socketDescriptor << " Connecting...";
connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
thread->start();
}
void myserver::acceptConnection()
{
c_client = s_server.nextPendingConnection();
connect(c_client,SIGNAL(readyRead()),this, SLOT(startRead()));
qDebug() << " Connecting...";
}

Answer 1

if(s_server.listen(QHostAddress::Any, port))
{
qDebug() << "Could not start server";
}
else
{
qDebug() << "Listening to port " ;
}
reads as "if the server CAN listen to any address on given port, print could not start server"
just change it to if (!s_server.listen(...)) and the missleading message should be gone