Dropping to debug shell

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http://forums.fedoraforum.org – When i try to install Fedora 17 Live Desktop from a USB thumb Drive it gives me the following error: " dracut Warning: Unable to process initgueue dracut Warning:/dev/disk/by-label/Fedora-17-x86_64-Live-Desktop. is doesnot exist dracut Warning:/dev/mapper/live-rw does not exist Dropping to debug shell. dracut:/# " Any solution? (HowTos)