Inheriting Constructors in C++(Qt)

I am deriving a class from the QTableWidgetItem class as following.

#ifndef NUMBERITEM_H
#define NUMBERITEM_H
#include <QTableWidgetItem>

class NumberItem: public QTableWidgetItem
{
 public:
    using QTableWidgetItem::QTableWidgetItem;
    bool operator < (const QTableWidgetItem &other) const
     {
         // TODO: To be safe, check weather conversion to int is possible.
         return (this->text().toInt() < other.text().toInt());
     }
 };

#endif // ITEM_H

According to answers in this question I can inherit the base class (QTableWidgetItem) by using keyword.But When I try to create a new NumberItem object like below.

NumberItem *numberItem = new NumberItem("string_value");

it gives the following error

    error: C2664: 'NumberItem::NumberItem(const NumberItem &)' : cannot convert parameter 1 from 'const char [13]' to 'const NumberItem &'
Reason: cannot convert from 'const char [13]' to 'const NumberItem'
No constructor could take the source type, or constructor overload resolution was ambiguous

How can I resolve this error?