Popovers cannot be presented from a view which does not have a window

Question

What does this error indicate:

\"Popovers cannot be presented from a view which does not have a window.\"

Answer 1

There will be a view from which you asks to display your popover.The reason for this error is because you didn't made this view as a subview of the window.

 [self.view addSubview:displayPopOverVC];

where displayPopOverVC is the view controller from which the popOver appears