Hello, I've encountered an error for when I want my application to do one of two things.


Normally when you create a QT application it starts the main window, well I've added the code

Qt Code: 
  1. std::ifstream ifile("C:/Program Files/Skittles/Install.cab");
  2.     if (ifile.good() == true)
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Depending on the true or false status it runs a different UI.

However I right click on Project Name > Add New > QT - QT designer form class > Dialog with buttons bottom.


Now this code here
Qt Code: 
  1. else if (ifile.good() == false)
  2.         {
  3.             install MyInstall;
  4.             MyInstall.setModal(true);
  5.             MyInstall.exec();
  6.         }
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Should open up the new UI since I named it install, I've included it's header file. But when I run it, a few things happen, 1: It will sucsessfully open 2: It will open for me but for a friend on Windows 8 it will not. 3: It gives a run time error http://gyazo.com/54b533dc8c40edbe837ad858eb6fdf3e 4: It says in the debug log "QWidget: Must construct a QApplication before a QPaintDevice"

To the extent I know this is all I have done to make this project and I am truly stuck on what to do or how to get it working. So any and all help would be greatly appreacted.