File "/usr/lib/python2.7/shelve.py", line 122, in __getitem__ value = Unpickler(f).load() EOFError

[wanggaolin]

Traceback (most recent call last):
File "/python/lib/test.py", line 30, in GetVlues
return self.Files.get(KeyName,'None')
File "/usr/lib/python2.7/shelve.py", line 114, in get
return self[key]
File "/usr/lib/python2.7/shelve.py", line 122, in getitem
value = Unpickler(f).load()
EOFError

How can I deal with it？