Quit, Exit qApp (program) if error?

[Arsenic]

I am trying to figure out how to properly exit and destroy all my classes if say an error happens.

Trying to make like a close the application if this message box pops up.

Doing this:

qApp->exec();
		return;

qApp->exec();
		return;

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Works, but it leaves the Process in Task Manager alive just the window doesn't show up.