from-accepted-date filter returning UrlSyntaxError

[daguiam]

I was trying to get my own works using the from_accepted_date filter and it returned this error.

from crossref.restful import Works
works = Works()

pub_date = '2001'
author='aguiam'
pub = works.query(author=author,).filter(from_accepted_date=pub_date
                                                    ).sort('published')

UrlSyntaxError: Filter from-accepted-date specified but there is no such filter for this route. Valid filters for this route are: from-event-start-date, has-update, has-abstract, article_number, until-update-date, from-posted-date, license.delay, has-update-policy, prefix, has-content-domain, has-authenticated-orcid, type, relation.type, from-event-end-date, has-orcid, archive, full-text.version, until-event-end-date, from-pub-date, until-index-date, has-full-text, has-assertion, until-posted-date, until-print-pub-date, has-affiliation, funder-doi-asserted-by, license.version, assertion, has-funder, member, from-created-date, has-domain-restriction, from-index-date, full-text.application, has-event, until-pub-date, until-event-start-date, from-deposit-date, relation.object-type, has-award, clinical-trial-number, assertion-group, until-deposit-date, award.funder, until-accepted-date, from-online-pub-date, until-online-pub-date, has-archive, license.url, orcid, type-name, isbn, full-text.type, has-relation, from-print-pub-date, until-created-date, from-update-date, has-clinical-trial-number, has-references, content-domain, doi, award.number, until-issued-date, has-license, issn, alternative_id, group-title, relation.object, is-update, container-title, directory, category-name, funder, from-accepted_date, has-funder-doi, update-type, updates, from-issued-date