I get an error 404 downloading 'convert graphdef memmapped format' with util/taskcluster.py

Hi, when i try to make a mmap-able model for inference, i use this command:
util/taskcluster.py --source tensorflow --artifact convert_graphdef_memmapped_format --target //tensorflow/contrib/util:convert_graphdef_memmapped_format
Docs

And get this error
Downloading https://index.taskcluster.net/v1/task/project.deepspeech.tensorflow.pip.master.cpu/artifacts/public/convert_graphdef_memmapped_format
Traceback (most recent call last):
File “util/taskcluster.py”, line 157, in
main()
File “util/taskcluster.py”, line 151, in main
maybe_download_tc(target_dir=args.target, tc_url=get_tc_url(args.arch, args.artifact, args.branch))
File “util/taskcluster.py”, line 57, in maybe_download_tc
urllib.request.urlretrieve(tc_url, target_file, reporthook=(report_progress if progress else None))
File “/usr/lib/python3.5/urllib/request.py”, line 188, in urlretrieve
with contextlib.closing(urlopen(url, data)) as fp:
File “/usr/lib/python3.5/urllib/request.py”, line 163, in urlopen
return opener.open(url, data, timeout)
File “/usr/lib/python3.5/urllib/request.py”, line 472, in open
response = meth(req, response)
File “/usr/lib/python3.5/urllib/request.py”, line 582, in http_response
‘http’, request, response, code, msg, hdrs)
File “/usr/lib/python3.5/urllib/request.py”, line 510, in error
return self._call_chain(*args)
File “/usr/lib/python3.5/urllib/request.py”, line 444, in _call_chain
result = func(*args)
File “/usr/lib/python3.5/urllib/request.py”, line 590, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found

I open the first URL on my chrome, and gets web response like json:
{

  • code: “ResourceNotFound”,

  • message: “Indexed task not found — * method: findArtifactFromTask * errorCode: ResourceNotFound * statusCode: 404 * time: 2019-09-26T10:39:09.951Z”,

  • requestInfo: {

    • method: “findArtifactFromTask”,

    • params: {

      • 0: “public/convert_graphdef_memmapped_format”,

      • indexPath: “project.deepspeech.tensorflow.pip.master.cpu”,

      • name: “public/convert_graphdef_memmapped_format”},

    • payload: { },

    • time: “2019-09-26T10:39:09.951Z”}

}

You should use --branch with the matching branch name, i.e., r1.14.