How to use the pympress.extras.FileWatcher.stop_watching function in pympress

page (`int`): the page at which to start the presentation
            reloading (`bool`): whether we are reloading or detecting stuff from the document
        """
        try:
            self.doc = document.Document.create(self, docpath)

            if not reloading and docpath:
                Gtk.RecentManager.get_default().add_item(self.doc.get_uri())
                extras.FileWatcher.watch_file(docpath, self.reload_document)

        except GLib.Error:
            if reloading:
                return
            self.doc = document.Document.create(self, None)
            self.error_opening_file(docpath)
            extras.FileWatcher.stop_watching()

        # Guess notes mode by default if the document has notes
        if not reloading:
            hpref = self.config.get('notes position', 'horizontal')
            vpref = self.config.get('notes position', 'vertical')
            self.chosen_notes_mode = target_mode = self.doc.guess_notes(hpref, vpref)

            # don't toggle from NONE to NONE
            if self.chosen_notes_mode == document.PdfPage.NONE:
                self.chosen_notes_mode = document.PdfPage.RIGHT

            if self.notes_mode != target_mode:
                self.switch_mode('swap_document', docpath, target_mode = target_mode)

        # Some things that need updating
        self.cache.swap_document(self.doc)