QextSerialPort question

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Hello, I'm trying to establish a communication between a microprocessor and my Ubuntu PC.

I'm using Qextserialport library. But some error occured I don't know why.

I tested the portname and it's like that attached "ttyACM0"

QextSerialPort *deneme = new QextSerialPort();
    deneme->setPortName("/dev/ttyACM0");
    deneme->setBaudRate(BAUD9600);
    deneme->setParity(PAR_NONE);
    deneme->setDataBits(DATA_8);
    deneme->setStopBits(STOP_1);
 
    if ( !(deneme->open(QIODevice::ReadWrite)) )
    {
        qDebug("error");    }
    if(deneme->isOpen())
    {
        qDebug("opened");
        deneme->close();
    }

QextSerialPort *deneme = new QextSerialPort();
    deneme->setPortName("/dev/ttyACM0");
    deneme->setBaudRate(BAUD9600);
    deneme->setParity(PAR_NONE);
    deneme->setDataBits(DATA_8);
    deneme->setStopBits(STOP_1);

    if ( !(deneme->open(QIODevice::ReadWrite)) )
    {
        qDebug("error");    }
    if(deneme->isOpen())
    {
        qDebug("opened");
        deneme->close();
    }

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When I run it, It just waits and "error" occured. What I am missing you think?

Thanks in advance