How to use the scrapelib.FTPError function in scrapelib

# Votes
        next_year = int(year_abr) + 1
        vote_info_list = [
            "A%s" % year_abr,
            "A%s" % next_year,
            "S%s" % year_abr,
            "S%s" % next_year,
            "CA%s-%s" % (year_abr, next_year),
            "CS%s-%s" % (year_abr, next_year),
        ]

        for filename in vote_info_list:
            s_vote_url = "ftp://www.njleg.state.nj.us/votes/%s.zip" % filename
            try:
                s_vote_zip, resp = self.urlretrieve(s_vote_url)
            except scrapelib.FTPError:
                self.warning("could not find %s" % s_vote_url)
                continue
            zippedfile = zipfile.ZipFile(s_vote_zip)
            for vfile in ["%s.txt" % (filename), "%sEnd.txt" % (filename)]:
                try:
                    vote_file = io.TextIOWrapper(
                        zippedfile.open(vfile, "r"), encoding="latin-1"
                    )
                except KeyError:
                    #
                    # Right, so, 2011 we have an "End" file with more
                    # vote data than was in the original dump.
                    #
                    self.warning("No such file: %s" % (vfile))
                    continue