Erro ao criar o word cloud

Boa noite, estou tendo o seguinte erro ao tentar criar o word cloud... Código...

cloud = WordCloud().generate(palavras)
plt.plot(cloud)

Erro...

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-70-5d07e464ce0e> in <module>
----> 1 cloud = WordCloud().generate(palavras)
      2 plt.plot(cloud)

~\Anaconda3\lib\site-packages\wordcloud\wordcloud.py in __init__(self, font_path, width, height, margin, ranks_only, prefer_horizontal, mask, scale, color_func, max_words, min_font_size, stopwords, random_state, background_color, max_font_size, font_step, mode, relative_scaling, regexp, collocations, colormap, normalize_plurals, contour_width, contour_color, repeat, include_numbers, min_word_length, collocation_threshold)
    333         self.contour_width = contour_width
    334         self.scale = scale
--> 335         self.color_func = color_func or colormap_color_func(colormap)
    336         self.max_words = max_words
    337         self.stopwords = stopwords if stopwords is not None else STOPWORDS

~\Anaconda3\lib\site-packages\wordcloud\wordcloud.py in __init__(self, colormap)
    103     """
    104     def __init__(self, colormap):
--> 105         import matplotlib.pyplot as plt
    106         self.colormap = plt.cm.get_cmap(colormap)
    107 

~\Anaconda3\lib\site-packages\matplotlib\pyplot.py in <module>
     34 from cycler import cycler
     35 import matplotlib
---> 36 import matplotlib.colorbar
     37 import matplotlib.image
     38 from matplotlib import rcsetup, style

~\Anaconda3\lib\site-packages\matplotlib\colorbar.py in <module>
     42 import matplotlib.collections as collections
     43 import matplotlib.colors as colors
---> 44 import matplotlib.contour as contour
     45 import matplotlib.cm as cm
     46 import matplotlib.gridspec as gridspec

~\Anaconda3\lib\site-packages\matplotlib\contour.py in <module>
     23 
     24 # Import needed for adding manual selection capability to clabel
---> 25 from matplotlib.blocking_input import BlockingContourLabeler
     26 
     27 # We can't use a single line collection for contour because a line

~\Anaconda3\lib\site-packages\matplotlib\blocking_input.py in <module>
     24 
     25 from matplotlib import cbook
---> 26 from matplotlib.backend_bases import MouseButton
     27 import matplotlib.lines as mlines
     28 

~\Anaconda3\lib\site-packages\matplotlib\backend_bases.py in <module>
     47     transforms, widgets, get_backend, is_interactive, rcParams)
     48 from matplotlib._pylab_helpers import Gcf
---> 49 from matplotlib.backend_managers import ToolManager
     50 from matplotlib.transforms import Affine2D
     51 from matplotlib.path import Path

~\Anaconda3\lib\site-packages\matplotlib\backend_managers.py in <module>
     37 
     38 
---> 39 class ToolManager:
     40     """
     41     Manager for actions triggered by user interactions (key press, toolbar

~\Anaconda3\lib\site-packages\matplotlib\backend_managers.py in ToolManager()
    184             del self._keys[k]
    185 
--> 186     @cbook._delete_parameter("3.3", "args")
    187     def update_keymap(self, name, key, *args):
    188         """

~\Anaconda3\lib\site-packages\matplotlib\cbook\deprecation.py in _delete_parameter(since, name, func)
    354         @_delete_parameter("3.1", "unused")
    355         def func(used_arg, other_arg, unused, more_args): ...
--> 356     """
    357 
    358     if func is None:

~\Anaconda3\lib\site-packages\matplotlib\cbook\deprecation.py in <listcomp>(.0)
    354         @_delete_parameter("3.1", "unused")
    355         def func(used_arg, other_arg, unused, more_args): ...
--> 356     """
    357 
    358     if func is None:

~\Anaconda3\lib\inspect.py in replace(self, name, kind, annotation, default)
   2547             default = self._default
   2548 
-> 2549         return type(self)(name, kind, default=default, annotation=annotation)
   2550 
   2551     def __str__(self):

~\Anaconda3\lib\inspect.py in __init__(self, name, kind, default, annotation)
   2474                 msg = '{} parameters cannot have default values'
   2475                 msg = msg.format(_get_paramkind_descr(self._kind))
-> 2476                 raise ValueError(msg)
   2477         self._default = default
   2478         self._annotation = annotation

ValueError: variadic positional parameters cannot have default values

PS: Todo o restante do do código está funcionando conforme as aulas.