`QObject' is an ambiguous base of `ClientThread'

[probine]

I have this class

#include <QTcpSocket>
#include <QTextBrowser>
#include "clientthread.h"
 
ClientThread::ClientThread(int socketDescriptor)
{
  _socketDescriptor = socketDescriptor;
  textBrowser = new QTextBrowser(this);
  setWindowTitle("Server version 0.9 beta");
  setCentralWidget(textBrowser);
  setFixedSize(400,400);
  show();
  run();
 
}
 
 
void ClientThread::run()
{  
  tcpSocket = new QTcpSocket();
  if(!tcpSocket->setSocketDescriptor(_socketDescriptor))
    textBrowser->append("Error in the connection");
  else
    textBrowser->append("Client successfully connected");
  iniConnection();
  exec();
}
 
 
void ClientThread::iniConnection()
{
  connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readData()));
}
 
void ClientThread::readData()
{
 
}

#include <QTcpSocket>
#include <QTextBrowser>
#include "clientthread.h"

ClientThread::ClientThread(int socketDescriptor)
{
  _socketDescriptor = socketDescriptor;
  textBrowser = new QTextBrowser(this);
  setWindowTitle("Server version 0.9 beta");
  setCentralWidget(textBrowser);
  setFixedSize(400,400);
  show();
  run();
  
}


void ClientThread::run()
{  
  tcpSocket = new QTcpSocket();
  if(!tcpSocket->setSocketDescriptor(_socketDescriptor))
    textBrowser->append("Error in the connection");
  else
    textBrowser->append("Client successfully connected");
  iniConnection();
  exec();
}


void ClientThread::iniConnection()
{
  connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readData()));
}

void ClientThread::readData()
{

}

To copy to clipboard, switch view to plain text mode 

When i try to compile it, I get this error:

clientthread.cpp:33: error: `QObject' is an ambiguous base of `ClientThread'

I know the error can be disabled in this lines

void ClientThread::iniConnection()
{
  connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readData()));
}

void ClientThread::iniConnection()
{
  connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readData()));
}

To copy to clipboard, switch view to plain text mode 

The "connect" is the problem

What is wrong ?