vagrant@contrib-stretch:~/src/wmf/release$ scap task-series blockers --count 26 --date 2019-04-15 1.34.0-wmf.1
1.34.0-wmf.1 : 2019-04-15 00:00:00, 1555286400
20:23:11 Unhandled error:
Traceback (most recent call last):
  File "/vagrant/scap/scap/cli.py", line 327, in run
    exit_status = method(app, app.extra_arguments)
  File "/home/vagrant/src/wmf/release/scap/plugins/task-series.py", line 152, in blockers
    var_dump(phab.maniphest.edit(transactions=trns))
  File "/home/vagrant/.local/lib/python2.7/site-packages/phabricator/__init__.py", line 248, in __call__
    return self._request(**kwargs)
  File "/home/vagrant/.local/lib/python2.7/site-packages/phabricator/__init__.py", line 323, in _request
    data = self._parse_response(response)
  File "/home/vagrant/.local/lib/python2.7/site-packages/phabricator/__init__.py", line 333, in _parse_response
    raise APIError(parsed['error_code'], parsed['error_info'])
APIError: ERR-CONDUIT-CORE: Transaction with key "3" has invalid type "custom.release.date". This type is not recognized. Valid types are: parent, column, space, title, owner, status, priority, points, description, parents.add, parents.remove, parents.set, subtasks.add, subtasks.remove, subtasks.set, view, edit, projects.add, projects.remove, projects.set, subscribers.add, subscribers.remove, subscribers.set, custom.release.version, custom.security_topic, custom.risk.summary, custom.risk.impacted, custom.risk.rating, subtype, comment, mfa.
20:23:11 task-series failed: <APIError> ERR-CONDUIT-CORE: Transaction with key "3" has invalid type "custom.release.date". This type is not recognized. Valid types are: parent, column, space, title, owner, status, priority, points, description, parents.add, parents.remove, parents.set, subtasks.add, subtasks.remove, subtasks.set, view, edit, projects.add, projects.remove, projects.set, subscribers.add, subscribers.remove, subscribers.set, custom.release.version, custom.security_topic, custom.risk.summary, custom.risk.impacted, custom.risk.rating, subtype, comment, mfa.