E       selenium.common.exceptions.StaleElementReferenceException: Message: The element reference of <button class="close" type="button"> is stale; either the element is no longer attached to the DOM, it is not in the current frame context, or the document has been refreshed

        self.wait()
        self.select('select', '1')
        self.dialog_button_click('cancel')

        # cert revoke
        self.action_list_action('revoke', confirm=False,
                                parents_css_sel=cert_widget_sel)
        self.wait()
        self.select('select', '1')
        self.dialog_button_click('ok')
>       self.close_notifications()

test_webui/test_service.py:269: