F12 preupgrade Error

[Luc MAIGNAN]

Hi,

i try to preupgrade my F11 to a F12 but id doesn't seem to work well...

preupgrade-cli -y "Fedora 12 (Constantine)"
/usr/lib/python2.6/site-packages/yum/__init__.py:203: UserWarning: Use 
.preconf instead of passing args to _getConfig
   warnings.warn('Use .preconf instead of passing args to _getConfig')
Modules complémentaires chargés : blacklist, whiteout
preupgrade-main (mirrorlist)
   url: 
http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-12&arch=$basearch
   now: http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-12&arch=i386
preupgrade (mirrorlist)
   url: 
http://mirrors.fedoraproject.org/mirrorlist?path=pub/fedora/linux/releases/12/Fedora/$basearch/os
   now: 
http://mirrors.fedoraproject.org/mirrorlist?path=pub/fedora/linux/releases/12/Fedora/i386/os
preupgrade-fedora (mirrorlist)
   url: https://mirrors.fedoraproject.org/metalink?repo=fedora-12&arch=i386
   now: https://mirrors.fedoraproject.org/metalink?repo=fedora-12&arch=i386
preupgrade-updates (mirrorlist)
   url: 
https://mirrors.fedoraproject.org/metalink?repo=updates-released-f12&arch=i386
   now: 
https://mirrors.fedoraproject.org/metalink?repo=updates-released-f12&arch=i386
Traceback (most recent call last):
   File "/usr/share/preupgrade/preupgrade-cli.py", line 305, in <module>
     pu.main(myrelease)
   File "/usr/share/preupgrade/preupgrade-cli.py", line 175, in main
     self.setup(myrelease)
   File "/usr/lib/python2.6/site-packages/preupgrade/__init__.py", line 
130, in setup
     self.complete_repo_setup()
   File "/usr/lib/python2.6/site-packages/preupgrade/__init__.py", line 
328, in complete_repo_setup
     repo._grabfunc.opts.user_agent = __user_agent__
AttributeError: 'NoneType' object has no attribute 'opts'


An idea ????

BR