Error using POS tagger about redshift HOT 6 CLOSED

➜  redshift git:(develop) ✗ py.test
========================================================= test session starts ==========================================================
platform darwin -- Python 2.7.6 -- py-1.4.26 -- pytest-2.6.4
collected 24 items 

tests/test_ae.py .............
tests/test_edit_ae.py .....
tests/test_lexicon.py .
tests/test_parser.py E
tests/test_tagger.py ...E

================================================================ ERRORS ================================================================
_____________________________________________________ ERROR at setup of test_parse _____________________________________________________

    @pytest.fixture
    def train_dir():
        import redshift.parser
>       redshift.parser.train(train_str, model_dir)

tests/test_parser.py:20: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
redshift/parser.pyx:111: in redshift.parser.train (redshift/parser.cpp:3039)
    parser.tagger.train_sent(py_sent)
redshift/tagger.pyx:122: in redshift.tagger.Tagger.train_sent (redshift/tagger.cpp:4013)
    self.guide.update(counts)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

>   ???
E   AssertionError

thinc/learner.pyx:81: AssertionError
______________________________________________________ ERROR at setup of test_tag ______________________________________________________

    @pytest.fixture
    def train_dir():
        import redshift.tagger
        sent_strs = []
        for sent_str in train_str.strip().split('\n\n'):
            sent = []
            for tok_str in sent_str.strip().split('\n'):
                fields = tok_str.split()
                sent.append('%s/%s' % (fields[1], fields[3]))
            sent_strs.append(' '.join(sent))
        train_pos = '\n'.join(sent_strs)
>       redshift.tagger.train(train_pos, model_dir)

tests/test_tagger.py:27: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
redshift/tagger.pyx:43: in redshift.tagger.train (redshift/tagger.cpp:2391)
    tagger.train_sent(sent)
redshift/tagger.pyx:122: in redshift.tagger.Tagger.train_sent (redshift/tagger.cpp:4013)
    self.guide.update(counts)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

>   ???
E   AssertionError

thinc/learner.pyx:81: AssertionError
================================================== 22 passed, 2 error in 1.71 seconds ==================================================