word_cloud: cannot open resource

I try to use it on Mac OS and there is a problem with PIL I think:

---------------------------------------------------------------------------
IOError                                   Traceback (most recent call last)
<ipython-input-148-0d09cb35794e> in <module>()
      2 elements = wordcloud.fit_words(freq_dist.items()[:200], width=500, height=500, font_path='/Users/paul/Library/Fonts/Verdana.ttf')
      3 # Draw the positioned words to a PNG file.
----> 4 wordcloud.draw(elements, 'tagcloud-%s.png' % hashtag, width=500, height=500)

/Library/Python/2.7/site-packages/wordcloud/__init__.pyc in draw(elements, file_name, font_path, width, height, scale, color_func)
    145     draw = ImageDraw.Draw(img)
    146     for (word, count), font_size, position, orientation in elements:
--> 147         font = ImageFont.truetype(font_path, font_size * scale)
    148         transposed_font = ImageFont.TransposedFont(font,
    149                                                    orientation=orientation)

/Library/Python/2.7/site-packages/PIL/ImageFont.pyc in truetype(filename, size, index, encoding)
    216                      and "armn" (Apple Roman). See the FreeType documentation
    217                      for more information.
--> 218     :return: A font object.
    219     :exception IOError: If the file could not be read.
    220     """

/Library/Python/2.7/site-packages/PIL/ImageFont.pyc in __init__(self, file, size, index, encoding)
    132         else:
    133             self.font_bytes = font.read()
--> 134             self.font = core.getfont("", size, index, encoding, self.font_bytes)
    135 
    136     def getname(self):

IOError: cannot open resource