yum upgrade

[Alex Thomsen Leth <alexl stofanet dk>]

im trying to do a yum uprade but im getting this error:



> Gathering header information file(s) from server(s)
> Server: Fedora Core 1.90 - Development Tree
> Finding updated packages
> Downloading needed headers
> Finding obsoleted packages
> Traceback (most recent call last):
>   File "/usr/bin/yum", line 30, in ?
>     yummain.main(sys.argv[1:])
>   File "/usr/share/yum/yummain.py", line 249, in main
>     obsoleting, obsoleted = clientStuff.returnObsoletes(HeaderInfo, rpmDBInfo, nulist)
>   File "/usr/share/yum/clientStuff.py", line 286, in returnObsoletes
>     rc = rpmUtils.compareEVR((e1, v1, r1), (obe, obv, obr))
>   File "/usr/share/yum/rpmUtils.py", line 120, in compareEVR
>     rc = rpm.labelCompare((e1, v1, r1), (e2, v2, r2))
> rpm.error: Invalid version or release - possibly None
> 
> what could be wrong
> 
> Alex Leth