Yum wont update after upgrade from f16 to f17

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http://forums.fedoraforum.org – Hi, I have recently upgraded from f16 to f17, now my yum won't update. Here is there error message I get. Code: shane@fedora ~ $ sudo yum -y update Loaded plugins: langpacks, presto, refresh-packagekit, tidy-cache, yum-fast-               : downloader Traceback (most recent call last):   File "/bin/yum", line 29, in <module>     yummain.user_main(sys.argv[1:], exit_code=True)   File "/usr/share/yum-cli/yummain.py", line 319, in user_main     errcode = main(args)   File "/usr/share/yum-c (HowTos)