Error "unable to read group information from repositories..."

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http://forums.fedoraforum.org – I got this error message when installing Fedora 11 by an installlation DVD (download from www.fedoraproject.org) Unable to read group information from repositories. This is a problem with the generation of your install tree. This error message appeared after the step that the installer asked me to choose where to install boot loader and configure the GRUB boot menu. The error message came with two button: [Retry] and [Exit installer]. Anyone knows what happened? Thanks for your support ^^! (HowTos)