nltk-udhr模块中出错[已关闭]

我在用python运行NLP代码片段时出错。。如下所示

>>> from nltk.corpus import udhr
>>> languages = ['Chickasaw','English','German_Deutsh',
...     'Greenlandic_Inuktikut','Hungarian_Magyar','Ibibio_Efik']
>>> cfd = nltk.ConditionalFreqDist(
...             (lang,len(word))
...             for lang in languages
...             for word in udhr.words(lang + '-Latin1'))
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
  File "/usr/local/lib/python2.7/dist-packages/nltk/probability.py", line 1729, in __init__
    for (cond, sample) in cond_samples:
  File "<stdin>", line 4, in <genexpr>
  File "/usr/local/lib/python2.7/dist-packages/nltk/corpus/reader/plaintext.py", line 91, in words
    in self.abspaths(fileids, True, True)])
  File "/usr/local/lib/python2.7/dist-packages/nltk/corpus/reader/api.py", line 167, in abspaths
    paths = [self._root.join(f) for f in fileids]
  File "/usr/local/lib/python2.7/dist-packages/nltk/data.py", line 176, in join
    return FileSystemPathPointer(path)
  File "/usr/local/lib/python2.7/dist-packages/nltk/data.py", line 154, in __init__
    raise IOError('No such file or directory: %r' % path)
IOError: No such file or directory: '/home/anupam/nltk_data/corpora/udhr/German_Deutsh-Latin1'

我已经导入了所需的模块,如 导入nltk 我刚接触python,有人能告诉我错误到底是什么吗。。