Can't use QSortFilterProxyModel in Qt quick application [solved]

I'm trying to create a QSortFilterProxyModel on qt creator 5.4.1 as below. But I don't know it always builds fail with the error: C2061 identifier QSortFilterProxyModel

Code:

---

#include <QApplication>
#include <QQmlContext>
#include <QQmlApplicationEngine>
#include "MyViewModel.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
 
    auto detailsProxyModel = new QSortFilterProxyModel();
}

---

Anyone can help me? Do i need to install anything else or do some configuration?


----> Sorry for any inconvenience. I forgot "#include <QSortFilterProxyModel>"
Thanks so much