Cartopy和matplotlib TypeError：无法散列的类型：'MultiLineString'

问题描述

我通过遵循Cartopy官方网站上提供的示例，尝试与Cartopy一起玩。 他们都正常工作，但第一个

import cartopy.crs as ccrs
import matplotlib.pyplot as plt

ax = plt.axes(projection=ccrs.PlateCarree())
ax.coastlines()

plt.show()

所有的行都可以正常工作，但是一旦我运行plt.show（）命令，我就会收到以下错误消息：

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1539, in __call__
    return self.func(*args)
  File "/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_tkagg.py", line 278, in resize
    self.show()
  File "/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_tkagg.py", line 349, in draw
    FigureCanvasAgg.draw(self)
  File "/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_agg.py", line 469, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/figure.py", line 1079, in draw
    func(*args)
  File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/mrvaita/python_workspace/gis_venv/local/lib/python2.7/site-packages/cartopy/mpl/geoaxes.py", line 359, in draw
    inframe=inframe)
  File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/matplotlib/axes/_base.py", line 2092, in draw
    a.draw(renderer)
  File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 59, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/home/mrvaita/python_workspace/gis_venv/local/lib/python2.7/site-packages/cartopy/mpl/feature_artist.py", line 113, in draw
    {})
  File "/usr/lib/python2.7/weakref.py", line 433, in setdefault
    return self.data.setdefault(ref(key, self._remove),default)
TypeError: unhashable type: 'MultiLineString'

有人已经对此有所了解吗？ 我的matplotlib版本是1.4.2，而Cartopy版本是0.13.0

预先非常感谢您的帮助。