Plugin install problem

hello,
i get a problem when i want to install a plugins from svn, for example:

H:\REAL_TEMP\eee\proj>ruby script\plugin install
http://svn.trebex.net/auto-admi
n/trunk/auto-admin --force
Plugin not found: [“http://svn.trebex.net/auto-admin/trunk/auto-admin”]

the same problem is for active scaffold.

what to do?

win xp sp2