python - matplotlib のエラー、何が欠けていますか?

Question

MacでPyCharmを使用して、SPy（Spectral Python）を試してきました。私はエラーの後にエラーに遭遇しましたが、現状では、このエラーは私が完全に困惑しています:

プログラム出力:

/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 "/Users/pkillam/PycharmProjects/untitled/SPy Experiments"
/Library/Python/2.7/site-packages/spectral/spectral.py:198: UserWarning: Unable to import or configure pylab plotter.  Spectrum plots will be unavailable.
  'will be unavailable.', UserWarning)

    .
    .    #normal output
    .

Traceback (most recent call last):
  File "/Users/pkillam/PycharmProjects/untitled/SPy Experiments", line 28, in <module>
    view = imshow(img, (29, 19, 9))
  File "/Library/Python/2.7/site-packages/spectral/graphics/spypylab.py", line 1238, in imshow
    import matplotlib.pyplot as plt
  File "/Library/Python/2.7/site-packages/matplotlib/pyplot.py", line 34, in <module>
    from matplotlib.figure import Figure, figaspect
  File "/Library/Python/2.7/site-packages/matplotlib/figure.py", line 40, in <module>
    from matplotlib.axes import Axes, SubplotBase, subplot_class_factory
  File "/Library/Python/2.7/site-packages/matplotlib/axes/__init__.py", line 4, in <module>
    from ._subplots import *
  File "/Library/Python/2.7/site-packages/matplotlib/axes/_subplots.py", line 10, in <module>
    from matplotlib.axes._axes import Axes
  File "/Library/Python/2.7/site-packages/matplotlib/axes/_axes.py", line 21, in <module>
    import matplotlib.dates as _  # <-registers a date unit converter
  File "/Library/Python/2.7/site-packages/matplotlib/dates.py", line 126, in <module>
    from dateutil.rrule import (rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY,
  File "/Library/Python/2.7/site-packages/dateutil/rrule.py", line 16, in <module>
    from six.moves import _thread
ImportError: cannot import name _thread

Process finished with exit code 1

そして、ここにコードがあります。主にここにある SPy ガイドからのものです: http://www.spectralpython.net/user_guide.html

import matplotlib
matplotlib.use('WX')
from spectral import *

img = open_image('92AV3C.lan')
print img.__class__
print
print img
print
print img.shape
pixel = img[50,100]
print
print pixel.shape
band6 = img[:,:,5]
print
print band6.shape
print

arr = img.load()
print arr.__class__
print
print arr.info()
print
print arr.shape

view = imshow(img, (29, 19, 9))

何か案は？