Unexpected StopIteration exception being raised.

I downloaded pattern module using pip. Then, when I try to run the example given in readme file, a StopIteration is being raised.
`
(ProjectIM) PS C:\Users\Sourav Kannantha B\Documents\ProjectIM\go bot> py .\pattern_ex.py
Traceback (most recent call last):
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text_init_.py", line 609, in _read
raise StopIteration
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\go bot\pattern_ex.py", line 11, in
v = tag(s)
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text\en_init_.py", line 188, in tag
for sentence in parse(s, tokenize, True, False, False, False, encoding, **kwargs).split():
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text\en_init_.py", line 169, in parse
return parser.parse(s, *args, **kwargs)
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text_init_.py", line 1172, in parse
s[i] = self.find_tags(s[i], **kwargs)
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text\en_init_.py", line 114, in find_tags
return Parser.find_tags(self, tokens, **kwargs)
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text_init.py", line 1113, in find_tags
lexicon = kwargs.get("lexicon", self.lexicon or {}),
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text_init_.py", line 376, in len
return self.lazy("len")
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text_init.py", line 368, in lazy
self.load()
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text_init.py", line 625, in load
dict.update(self, (x.split(" ")[:2] for x in _read(self.path) if len(x.split(" ")) > 1))
File "C:\Users\Sourav Kannantha B\Documents\ProjectIM\lib\site-packages\pattern\text_init.py", line 625, in
dict.update(self, (x.split(" ")[:2] for x in _read(self._path) if len(x.split(" ")) > 1))
RuntimeError: generator raised StopIteration
`

Start in pattern/text/init.py at _read(), load(), and the parser path shown in the traceback. Reproduce the README example that calls tag(s), then trace why _read() leads to the generator error. Done means the example runs without StopIteration or RuntimeError and produces its parsed output.