Invalid Y coordinate index in model mapper error

[IknowQT]

A class that inherits Abstractmodel connects charts and tables. If the chart is drawn again after initializing the table data, the message Invalid Y coordinate index in model mapper is generated.
what is this error message

void usrTableModel::InitData(const QList< QPair<QString, QList<qreal>> >& data)
{
	this->beginResetModel();
	{
		m_lstData = data;
	}
	this->endResetModel();
}

void wSpectrum::AddChartSeries(bool isData, usrTableModel* pModel)
{
	QLineSeries* pSeries = new QLineSeries(m_pChart);
    pSeries->setUseOpenGL(true);							// 속도 향상

	QVXYModelMapper* mapper = new QVXYModelMapper(this);
	mapper->setXColumn(0);
	mapper->setYColumn(pModel->GetColCount()-1);
	
	if(isData)
		mapper->setSeries(pSeries);

	mapper->setModel(pModel);

	m_pChart->addSeries(pSeries); 
	m_pChart->createDefaultAxes();

	// [축 재설정] 
	{
		QValueAxis* axisx = qobject_cast<QValueAxis*>(m_pChart->axes(Qt::Horizontal).first());
		axisx->setTickCount(5);

		m_pChart->axisX()->setTitleFont(cGlobalParam::gGetChartAxis(true));
		m_pChart->axisX()->setTitleText("Wave Length");
		m_pChart->axisX()->setTitleBrush(QBrush(QColor(76, 127, 185)));		

		m_pChart->axisY()->setTitleFont(cGlobalParam::gGetChartAxis(true));
		m_pChart->axisY()->setTitleText("Absorbance.");
		m_pChart->axisY()->setTitleBrush(QBrush(QColor(76, 127, 185)));
	}

	// [행의 마지막 위치로 이동]
	QModelIndex index = pModel->index(0, pModel->GetColCount()-1, QModelIndex());
	this->ui.tableWidget->scrollTo(index, QAbstractItemView::PositionAtTop);
}