BigQuery Data Transfer autosynthesis fails

[chingor13]

Cloning into 'working_repo'...
Switched to branch 'autosynth-bigquerydatatransfer'
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/bigquery/datatransfer/artman_bigquerydatatransfer.yaml.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
Traceback (most recent call last):
  File "synth.py", line 27, in <module>
    artman_output_name='google-cloud-bigquerydatatransfer-v1')
  File "/home/kbuilder/.local/lib/python3.6/site-packages/synthtool/gcp/gapic_generator.py", line 53, in java_library
    return self._generate_code(service, version, "java", **kwargs)
  File "/home/kbuilder/.local/lib/python3.6/site-packages/synthtool/gcp/gapic_generator.py", line 123, in _generate_code
    f"Unable to find generated output of artman: {genfiles}."
FileNotFoundError: Unable to find generated output of artman: /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java/google-cloud-bigquerydatatransfer-v1.
synthtool > Cleaned up 1 temporary directories.

Synthesis failed