Why is this happening?
Adsız.png

//mainwindow.cpp
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include<QtCore>
  4. #include<QtGui>
  5. #include<QMessageBox>
  6. #include"secondwindow.h"
  7.  
  8. MainWindow::MainWindow(QWidget *parent) :
  9.     QMainWindow(parent),
  10.     ui(new Ui::MainWindow)
  11. {
  12.     ui->setupUi(this);
  13. }
  14.  
  15. MainWindow::~MainWindow()
  16. {
  17.     delete ui;
  18. }
  19.  
  20. void MainWindow::on_pushButton_clicked()
  21. {
  22.     QMessageBox::information (this, "Title", "kaydedildi");
  23. }
  24.  
  25. [B]void MainWindow::on_pushButton_3_clicked()  //When i clicked this button the problem occurs
  26. {
  27.     msecond = new Secondwindow(this);
  28.     msecond->show();
  29. }[/B]
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