Qt5: call to non-static member function without an object when using dropMimeData

I am trying to implement a drag and drop function between rows of a QTableView. I am using this source as guideline for the implementation. However I have some problems when implementing dropMimeData to extend the drag and drop to the entire QTableView but there is a non static member function without an object argument error.

Here the part of the code that is throwing the error and that I am not sure how to take care:

tablemodel.h

class TableModel : public QAbstractListModel
{
    Q_OBJECT
public:
    TableModel();
    // additional functions....
    bool dropMimeData(const QMimeData *data, Qt::DropAction action,
                      int row, int column, const QModelIndex &parent);

private:
    QList<QStringList> m_data;

};

tablemodel.cpp

bool TableModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent)
{
    Q_UNUSED(parent);
    Q_UNUSED(column);
    if(row == -1) {
        row = rowCount();
    }
    return QAbstractTableModel::dropMimeData(data, action, row, 0, parent); // <-- Error here
}

on the line return QAbstractTableModel::dropMimeData(data, action, row, 0, parent); the compiler throws the error of:

call to non-static member function without an object argumenmt

Thank you for shedding light on this problem