Yum upgrade from FC2 to FC3 possible?

[Tony Jones]

Is it possible to upgrade (using yum or anything else) from FC2 (development) 
to FC3 (development)?  Or do I need to start with the FC3 iso's.

I installed the FC2T1 iso's (2/19/04) and ran yum a couple of times against 
the 1.90 development branch.  This is where my machine is now.  Then I
context switched away.

Trying to use the yum.conf that had worked before now causes yum to crash
(of course I have no idea if it would do what i want [->FC3] anyway):

# yum -c yum.conf update
Gathering header information file(s) from server(s)
Server: Fedora Core 1.90 - Development Tree
Finding updated packages
Downloading needed headers
Traceback (most recent call last):
  File "/usr/bin/yum", line 30, in ?
    yummain.main(sys.argv[1:])
  File "/usr/share/yum/yummain.py", line 253, in main
    clientStuff.download_headers(HeaderInfo, nulist)
  File "/usr/share/yum/clientStuff.py", line 919, in download_headers
    cachedbdict = returnCacheDBHeaders(nulist)
  File "/usr/share/yum/clientStuff.py", line 901, in returnCacheDBHeaders
    mi = cachedb.dbMatch()
UnboundLocalError: local variable 'cachedb' referenced before assignment

Tony