Using cobbler 1.6.2 on Centos 5.2, I am try to deploy a RHEL 5.3 system. I get as far a selecting what disk I want to format and confirm. Then I am prompted with this error:

Unable to read package metadata. This may be due to a missing repodata directory. Please ensure that your install tree has been correctly generated. failure: repodata/primary.xml.gz from anaconda-base-200901061732.x86_64: {Errno 256] No more mirrors to try.

I re-imported the distro several times using a different name, and each I was able to reproduce the error.

I imported the RHEL 5.3 DVD, by issuing:

cobbler import --name="rhel-srv-5.3-64bit" --mirror=/mnt --rsync-flags="--quiet" --arch=x86_6

The output from this is available on pastebin, I had to split in three:

http://cobbler.pastebin.com/d5052eb98
http://cobbler.pastebin.com/d252ead8a
http://cobbler.pastebin.com/d29dd5d91