Build failed in Jenkins: quantal-desktop-amd64_ChinaImage #3

[Jenkins Notification]

See <http://10.189.74.2:8080/job/quantal-desktop-amd64_ChinaImage/3/>

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Started due to content change in http://cdimage.ubuntu.com/daily-live/current/SHA256SUMS
[EnvInject] - Loading node environment variables.
Building remotely on alderamin
[quantal-desktop-amd64_ChinaImage] $ /bin/bash /tmp/hudson5566042152356103514.sh
ln: failed to create symbolic link `/var/lib/ubuntu-server-iso-testing/isos/ubuntu-desktop/ubuntu': File exists
Usage: download-latest-test-iso [options]

download-latest-test-iso: error: no such option: --host
Build step 'Execute shell' marked build as failure
Archiving artifacts
Recording test results
[description-setter] Could not determine description.