Hi, I am just getting started with dedupe and tried to run the csv_example out of the box and ran into this error:

Traceback (most recent call last):
File "csv_example.py", line 161, in
threshold = deduper.threshold(data_d, recall_weight=2)
File "/Users/suneetdewan/Documents/projects/dedupe/dedupe/api.py", line 237, in threshold
return self.thresholdBlocks(blocked_pairs, recall_weight)
File "/Users/suneetdewan/Documents/projects/dedupe/dedupe/api.py", line 68, in thresholdBlocks
probability = core.scoreDuplicates(self._blockedPairs(blocks),
File "/Users/suneetdewan/Documents/projects/dedupe/dedupe/api.py", line 248, in _blockedPairs
block, blocks = core.peek(blocks)
File "/Users/suneetdewan/Documents/projects/dedupe/dedupe/core.py", line 279, in peek
record = next(records)
File "/Users/suneetdewan/Documents/projects/dedupe_env/lib/python2.7/site-packages/future/builtins/newnext.py", line 59, in newnext
return iterator.next()
File "/Users/suneetdewan/Documents/projects/dedupe/dedupe/api.py", line 281, in _blockData
for block in viewvalues(blocks):
File "/Users/suneetdewan/Documents/projects/dedupe_env/lib/python2.7/site-packages/future/utils/init.py", line 297, in viewvalues
return func(**kwargs)
File "/Users/suneetdewan/Documents/projects/dedupe_env/lib/python2.7/UserDict.py", line 120, in values
return [v for _, v in self.iteritems()]
File "/Users/suneetdewan/Documents/projects/dedupe_env/lib/python2.7/UserDict.py", line 110, in iteritems
for k in self:
File "/Users/suneetdewan/Documents/projects/dedupe_env/lib/python2.7/UserDict.py", line 97, in iter
for k in self.keys():
File "/Users/suneetdewan/anaconda/lib/python2.7/shelve.py", line 101, in keys
return self.dict.keys()
SystemError: Negative size passed to PyString_FromStringAndSize

running on python 2.7 with osx.