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ValueError: need more than 0 values to unpack in gazetteer_example.py

See original GitHub issue

I can’t run gazetteer_example on Ubuntu:

$ python gazetteer_example.py
importing data ...
gazetteer_example.py:53: RuntimeWarning: Argument <type 'str'> is not an unicode object. Passing an encoded string will likely have unexpected results.
  column = unidecode(column)
N data 1 records: 1081
N data 2 records: 1092
/home/alix/.local/lib/python2.7/site-packages/dedupe/sampling.py:39: UserWarning: 7500 blocked samples were requested, but only able to sample 7498
  % (sample_size, len(blocked_sample)))
starting active labeling...
# labeling...
Finished labeling
Start calculating threshold
Threshold: 0.148433491588
Traceback (most recent call last):
  File "gazetteer_example.py", line 165, in <module>
    results = gazetteer.match(messy, threshold=threshold, n_matches=1)
  File "/home/alix/.local/lib/python2.7/site-packages/dedupe/api.py", line 992, in match
    return list(clusters)
  File "/home/alix/.local/lib/python2.7/site-packages/dedupe/clustering.py", line 200, in gazetteMatching
    for block in scored_blocks:
  File "/home/alix/.local/lib/python2.7/site-packages/dedupe/core.py", line 345, in scoreGazette
    for scored_pairs in imap(score_records, records):
  File "/usr/lib/python2.7/multiprocessing/pool.py", line 668, in next
    raise value
ValueError: need more than 0 values to unpack