run in xp get error actually the *encrypted* IV

im run crypto.cipher in xp getting error

Traceback (most recent call last):
  File "test.py", line 3, in <module>
  File "Crypto\Cipher\AES.pyc", line 50, in <module>
    actually the *encrypted* IV which was prefixed to the ciphertext).
  File "Crypto\Cipher\_AES.pyc", line 12, in <module>