QThread class does emit signal

[saman_artorious]

I get error when I want to emit a signal from inside of my consumer class, here the code:

#ifndef CONSUMER_H
#define CONSUMER_H
 
#include <QSemaphore>
#include <QQueue>
 
extern QSemaphore freeBytes;
extern QSemaphore usedBytes;
extern QQueue<QByteArray>     queue;
 
class Consumer : public QThread
{
public:
    void run();
signals:
    void sendPackToAllComponents(QByteArray );
};
 
void Consumer::run()
{
    for(;;)
    {
        if(queue.size() > 0)
        {
            usedBytes.acquire();
            QByteArray pack = queue.dequeue();
            emit sendPackToAllComponents(pack);
            freeBytes.release();
 
            qDebug() << "pack=" <<pack;
 
        }
    }
}
#endif // CONSUMER_H

#ifndef CONSUMER_H
#define CONSUMER_H

#include <QSemaphore>
#include <QQueue>

extern QSemaphore freeBytes;
extern QSemaphore usedBytes;
extern QQueue<QByteArray>     queue;

class Consumer : public QThread
{
public:
    void run();
signals:
    void sendPackToAllComponents(QByteArray );
};

void Consumer::run()
{
    for(;;)
    {
        if(queue.size() > 0)
        {
            usedBytes.acquire();
            QByteArray pack = queue.dequeue();
            emit sendPackToAllComponents(pack);
            freeBytes.release();

            qDebug() << "pack=" <<pack;
            
        }
    }
}
#endif // CONSUMER_H

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And here's how I connected the signal to the slot of another object inside main()

QCoreApplication a(argc, argv);
    Consumer *consumer = new Consumer();
    rs485 *rs_485 = new rs485();
    exhaustSystem *MyExhaust = new exhaustSystem();
    QByteArray packet;
    packet.append(0x04);
    consumer->start();
    QObject::connect(MyExhaust, SIGNAL(EXHAUST_SendToRS485(QByteArray)), rs_485, SLOT(rs485DataAquisition(QByteArray)));
    QObject::connect(consumer, SIGNAL(sendPackToAllComponents(QByteArray)),MyExhaust, SLOT(EXHAUST_DataReceive(QByteArray)));
 
    rs_485->rs485DataAquisition(packet);

QCoreApplication a(argc, argv);
    Consumer *consumer = new Consumer();
    rs485 *rs_485 = new rs485();
    exhaustSystem *MyExhaust = new exhaustSystem();
    QByteArray packet;
    packet.append(0x04);
    consumer->start();
    QObject::connect(MyExhaust, SIGNAL(EXHAUST_SendToRS485(QByteArray)), rs_485, SLOT(rs485DataAquisition(QByteArray)));
    QObject::connect(consumer, SIGNAL(sendPackToAllComponents(QByteArray)),MyExhaust, SLOT(EXHAUST_DataReceive(QByteArray)));
    
    rs_485->rs485DataAquisition(packet);

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This is the exhaust class where it's SLOT is connected to the consumer thread SendTOALLOBJECT SIGNAL:

class exhaustSystem : public QObject
{
    Q_OBJECT
public:
    explicit exhaustSystem(QObject *parent = 0);
 
signals:
    void EXHAUST_SendToRS485(QByteArray );
    void stop_diesel();
public slots:
 
    void EXHAUST_DataReceive(QByteArray);
.....

class exhaustSystem : public QObject
{
    Q_OBJECT
public:
    explicit exhaustSystem(QObject *parent = 0);

signals:
    void EXHAUST_SendToRS485(QByteArray );
    void stop_diesel();
public slots:

    void EXHAUST_DataReceive(QByteArray);
.....

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