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I'm tyring to do this

$ sudo yum install gnome-tweak-tool

And I get this instant response:

Loaded plugins: langpacks, presto, refresh-packagekit [Errno 14] HTTP Error 404 - Not Found :
Trying other mirror.
Error: failure: repodata/repomd.xml from pgdg91: [Errno 256] No more mirrors to try. [Errno 14] HTTP Error 404 - Not Found :

I think I messed up the yum repo, is there a way to fix this?

share|improve this question
First Find Which .repo file is giving problem. For that first change directory to /etc/yum.repos.d/ after that in the terminal write this command grep -r "" . and press Enter. please Post the output in your next comment. – max Jun 13 '13 at 9:18
OR try this command yum clean all – max Jun 13 '13 at 9:22

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