File "/root/.cache/pants/setup/bootstrap/pants.zgaZaX/install/local/lib/python2.7/site-packages/pants/backend/jvm/tasks/detect_duplicates.py", line 119, in _get_conflicts_by_artifacts
    conflicts_by_artifacts[tuple(sorted(artifacts))].add(file_name)
  File "/root/.cache/pants/setup/bootstrap/pants.zgaZaX/install/local/lib/python2.7/site-packages/pants/build_graph/target.py", line 510, in __lt__
    return self.address < other.address

Exception message: 'unicode' object has no attribute ‘address’