Fails for build ISO by pungi+lorax on Fedora16

[Eric Zhong]

OS: Fedora16
Tool: pungi + lorax  (yum install pungi)
Error:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/yum/rpmtrans.py", line 446, in
callback
  File "/usr/lib/python2.7/site-packages/yum/rpmtrans.py", line 524, in
_instProgress
  File "/usr/lib/python2.7/site-packages/pylorax/yumhelper.py", line 102,
in event
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-3:
ordinal not in range(128)
error: python callback <bound method RPMTransaction.callback of
<yum.rpmtrans.RPMTransaction instance at 0xd0b27cc>> failed, aborting!

If there is a bug , how Fedora16 DVD was born ???
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