Shouldn't it be from svn.jboss.org/repos/jbossas/trunk? I tried svn.jboss.org/repos/common/trunk, but it doesn't exist...
Going back and finding a working revision of /trunk is a fruitless exercise due to the use of SNAPSHOT versions in thirdparty dependencies. For archival purposes only lets just tag the last revision which chhanged the Admin Console src:
From http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbossas/trunk/admin-console/ it looks to be r57108, so lets do:
svn copy -r 57108 https://svn.jboss.org/repos/jbossas/trunk https://svn.jboss.org/repos/jbossas/tags/JBossAdminConsole_1_1_SNAPSHOT -m "Tag of r57108 of jbossas/trunk for a 1.1 snapshot of the 'admin-console' project."
Next step is to move the project out of /trunk, but lets discuss that here:
This step was completed. Now off to moving the project as noted in topic 91371 (link is in Charles' post above).