Traceback (most recent call last):


 "<string>", line 4, in <module>


 "/usr/lib/python3.6/site-packages/matplotlib/pyplot.py", line 3031, in fill

ret = ax.fill(*args, **kwargs)


 "/usr/lib/python3.6/site-packages/matplotlib/__init__.py", line 1855, in inner

return func(ax, *args, **kwargs)


 "/usr/lib/python3.6/site-packages/matplotlib/axes/_axes.py", line 4975, in fill

for poly in self._get_patches_for_fill(*args, **kwargs):


 "/usr/lib/python3.6/site-packages/matplotlib/axes/_base.py", line 406, in _grab_next_args

for seg in self._plot_args(this, kwargs):


 "/usr/lib/python3.6/site-packages/matplotlib/axes/_base.py", line 396, in _plot_args

seg = func(x[:, j % ncx], y[:, j % ncy], kw, kwargs)


 "/usr/lib/python3.6/site-packages/matplotlib/axes/_base.py", line 348, in _makefill

closed=kw['closed'])


 "/usr/lib/python3.6/site-packages/matplotlib/patches.py", line 960, in __init__

self.set_xy(xy)


 "/usr/lib/python3.6/site-packages/matplotlib/patches.py", line 1029, in set_xy

self._path = Path(xy, closed=self._closed)


 "/usr/lib/python3.6/site-packages/matplotlib/path.py", line 147, in __init__

codes[0] = self.MOVETO
IndexError: index 0 is out of bounds for axis 0 with size 0

Traceback (most recent call last):

 "/home/donnut/anaconda/envs/iepy/bin/iepy", line 7, in <module>
from iepy.instantiation.command_line import execute_from_command_line

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/iepy/instantiation/command_line.py", line 20, in <module>
import nltk.data

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/__init__.py", line 117, in <module>
from nltk.align import *

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/align/__init__.py", line 15, in <module>
from nltk.align.ibm1 import IBMModel1

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/align/ibm1.py", line 18, in <module>
from nltk.corpus import comtrans

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/corpus/__init__.py", line 64, in <module>
from nltk.tokenize import RegexpTokenizer

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/tokenize/__init__.py", line 65, in <module>
from nltk.tokenize.regexp
import (RegexpTokenizer, WhitespaceTokenizer,

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/tokenize/regexp.py", line 201, in <module>
blankline_tokenize = BlanklineTokenizer().tokenize

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/tokenize/regexp.py", line 172, in __init__
RegexpTokenizer.__init__(self, r'\s*\n\s*\n\s*', gaps=True)

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/tokenize/regexp.py", line 119, in __init__
self._regexp = compile_regexp_to_noncapturing(pattern, flags)

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/internals.py", line 54, in compile_regexp_to_noncapturing
return sre_compile.compile(convert_regexp_to_noncapturing_parsed(sre_parse.parse(pattern)), flags=flags)

 "/home/donnut/anaconda/envs/iepy/lib/python3.5/site-packages/nltk/internals.py", line 50, in convert_regexp_to_noncapturing_parsed
parsed_pattern.pattern.groups = 1AttributeError: can't set attribute