"Unexpected End of data" error while implementing tensorflow translate

I was implementing the code of models/rnn/translate/translate.py. The code i am using is same as given in "https://github.com/tensorflow/tensorflow/blob/master/tensorflow/models/rnn/translate/translate.py" but it gives error . "ReadError: unexpected end of data" while executing it . How to proceed.

Traceback (most recent call) buf = self.fileobj.read(size) 749 if len(buf) != size: --> 750 raise ReadError("unexpected end of data") 751 return buf