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Issue with fb_pathmgr

See original GitHub issue

Hello, I am running the interactive translation (via PyTorch Hub) example.

When I run the command en2de = torch.hub.load('pytorch/fairseq', 'transformer.wmt16.en-de', tokenizer='moses', bpe='subword_nmt')

I am getting the following error:

File "torch/hub/pytorch_fairseq_master/fairseq/checkpoint_utils.py", line 140, in load_checkpoint_to_cpu
    from fairseq.fb_pathmgr import fb_pathmgr
ImportError: No module named 'fairseq.fb_pathmgr'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/lib/python3.5/site-packages/torch/hub.py", line 363, in load
    model = entry(*args, **kwargs)
  File "torch/hub/pytorch_fairseq_master/fairseq/models/fairseq_model.py", line 172, in from_pretrained
    **kwargs,
  File "torch/hub/pytorch_fairseq_master/fairseq/hub_utils.py", line 54, in from_pretrained
    arg_overrides=kwargs,
  File "torch/hub/pytorch_fairseq_master/fairseq/checkpoint_utils.py", line 178, in load_model_ensemble_and_task
    state = load_checkpoint_to_cpu(filename, arg_overrides)
  File "torch/hub/pytorch_fairseq_master/fairseq/checkpoint_utils.py", line 145, in load_checkpoint_to_cpu
    except (ModuleNotFoundError, ImportError):
NameError: name 'ModuleNotFoundError' is not defined

Can you please help me resolve this?

Thanks!