the AAm problems

[redforg]

when i use the doc in http://www.menpo.org/menpofit/aam.html
`%matplotlib inline

from menpowidgets import visualize_images

visualize_images(training_images)`
i get something wrong like this

ValueError Traceback (most recent call last)
in ()
17 get_ipython().magic('matplotlib inline')
18 from menpowidgets import visualize_images
---> 19 visualize_images(training_images)

D:\ProgramFiles\Anaconda\envs\test\lib\site-packages\menpowidgets\base.py in visualize_images(images, figure_size, browser_style, custom_info_callback)
586 n_channels=images[0].n_channels,
587 image_is_masked=isinstance(images[0], MaskedImage),
--> 588 render_function=render_function)
589 landmark_options_wid = LandmarkOptionsWidget(
590 group_keys=groups_keys, labels_keys=labels_keys,

D:\ProgramFiles\Anaconda\envs\test\lib\site-packages\menpowidgets\options.py in init(self, n_channels, image_is_masked, render_function, style)
1574
1575 # Set values
-> 1576 self.set_widget_state(n_channels, image_is_masked, allow_callback=False)
1577
1578 # Set slider update

D:\ProgramFiles\Anaconda\envs\test\lib\site-packages\menpowidgets\options.py in set_widget_state(self, n_channels, image_is_masked, allow_callback)
1856 render_function = self._render_function
1857 self.remove_render_function()
-> 1858 self.remove_callbacks()
1859
1860 # Assign properties

D:\ProgramFiles\Anaconda\envs\test\lib\site-packages\menpowidgets\options.py in remove_callbacks(self)
1627 self._save_glyph, names='selected_values', type='change')
1628 self.cmap_select.unobserve(
-> 1629 self._save_options, names='value', type='change')
1630 self.alpha_slider.unobserve(
1631 self._save_options, names='value', type='change')

D:\ProgramFiles\Anaconda\envs\test\lib\site-packages\traitlets\traitlets.py in unobserve(self, handler, names, type)
1284 names = parse_notifier_name(names)
1285 for n in names:
-> 1286 self._remove_notifiers(handler, n, type)
1287
1288 def unobserve_all(self, name=All):

D:\ProgramFiles\Anaconda\envs\test\lib\site-packages\traitlets\traitlets.py in _remove_notifiers(self, handler, name, type)
1194 del self._trait_notifiers[name][type]
1195 else:
-> 1196 self._trait_notifiers[name][type].remove(handler)
1197 except KeyError:
1198 pass

ValueError: list.remove(x): x not in list

how can i fix this?thanks very much.