QWidget::create: Failed to create window () Why my application crash?

[8Observer8]

Hi,

QWidget::create: Failed to create window () Why my application crash?

DialogByButton.pro


SOURCES += \
main.cpp \
mainwindow.cpp \
dialog.cpp

HEADERS += \
mainwindow.h \
dialog.h


main.cpp


#include <QApplication>
#include "mainwindow.h"

int main (int argc, char *argv[]) {
QApplication app(argc, argv);

MainWindow window;
window.show();

return app.exec();
}


mainwindow.h


#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtGui>

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);

signals:
//void sendName(QString name);

private slots:
//void callDialog();

private:
QLineEdit *leName;
};

#endif // MAINWINDOW_H


mainwindow.cpp


#include "mainwindow.h"
//#include "dialog.h"
//#include <QWidget>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent)
{
// Controls
//QLabel *lblName = new QLabel(tr("Enter your name:"));
leName = new QLineEdit;
//QPushButton *btnCallDialog = new QPushButton(tr("Call Dialog"));

// // Layout
// QGridLayout *mainLayout = new QGridLayout(this);
// mainLayout->addWidget(lblName, 0, 0);
// mainLayout->addWidget(leName, 0, 1);
// mainLayout->addWidget(btnCallDialog, 1, 0, 1, 2);

// // Set center widget
// QWidget *widget = new QWidget;
// widget->setLayout(mainLayout);
// this->setCentralWidget(widget);

// //connect(btnCallDialog, SIGNAL(clicked()), this, SLOT(callDialog()));
}

//void MainWindow::callDialog() {
// QDialog *dialog = new QDialog(this);
// connect(this, SIGNAL(sendName(QString)), dialog, SLOT(showName(QString)));
// emit sendName(leName->text());
// dialog->show();
//}


Sorry, I solved this problem. I click "Clean".