QThread ошибка

#ifndef MYTHREAD_H
#define MYTHREAD_H
#include <QtCore>
#include <sys/socket.h>
#include <cstdio>
#include <QTextEdit>
 
 
class mythread : public QThread
{
public:
    int sock;
    QTextEdit *outStream;
    mythread(const int _sock, QTextEdit* _outStream);
    void run();
    ~mythread(){
        this->exit();
    }
};
#endif // MYTHREAD_H

#include "mythread.h"
 
mythread::mythread(const int _sock, QTextEdit* _outStream) : sock(_sock)
{
    outStream = _outStream;
 
}
 
void mythread::run(){
    char buf[1024];
    int count;
    while(true){
        count = recv(sock, buf, sizeof(buf), MSG_NOSIGNAL);
        if(count == -1){
            qDebug("Error recv.\n");
            break;
        }
        qDebug("Message from server: %s", buf);
        outStream->setText(outStream->toPlainText() +  QString(buf));
    }
}

th = new mythread(sock->getSockId(), ui->textEdit);
        th->start();

class mythread : public QThread
{
    Q_OBJECT
public:
    int sock;
    mythread(const int _sock, QObject* parent = 0);
    void run();
    ~mythread(){
        this->quit();
    }
signals:
    void changeText(QString str);
};

mythread::mythread(const int _sock, QObject *parent) : QThread(parent),sock(_sock)
{
    moveToThread(this);
}
 
void mythread::run(){
    char buf[1024];
    int count;
    while(true){
        count = recv(sock, buf, sizeof(buf), MSG_NOSIGNAL);
        if(count == -1){
            qDebug("Error recv.\n");
            break;
        }
        qDebug("Message from server: %s", buf);
        QString str(buf);
        emit changeText(str);
    }
}

connect(th,SIGNAL(changeText(QString)), this, SLOT(onTextChanged(QString)));