0launch fails, RPM database and implementations missing (?)

Hello,

0lauching the lyx feed fails, giving a warning about a missing 
/var/lib/rpm/Packages file, and saying that there are no implementations 
for the feed. Is this a problem of the feed, or of RPM? the latter is 
installed on this (freebsd) machine but I don't know how it is 
configured and I don't have root access.
Attached is the verbose output. How should I proceed? thanks in advance.

[dgirardi <at> kaneli /var/lib/rpm]$ 0launch -cv 
http://0install.net/2007/3rd-party/LyX.xml
INFO:root:Running 0launch 0.35 
['http://0install.net/2007/3rd-party/LyX.xml']; Python 2.4.3 (#2, Oct 19 
2006, 13:34:46)
[GCC 3.4.6 [FreeBSD] 20060305]
INFO:root:Interface <Interface 
http://0install.net/2007/3rd-party/LyX.xml> has no implementations!
INFO:root:Scheduling new task: solve_with_downloads
INFO:root:Scheduling new task: quitter
INFO:root:Interface <Interface 
http://0install.net/2007/3rd-party/LyX.xml> has no implementations!
INFO:root:Scheduling new task: download 
http://0install.net/2007/3rd-party/LyX.xml
INFO:root:Scheduling new task: download_done_stats
INFO:root:Scheduling new task: fetch_feed 
http://0install.net/2007/3rd-party/LyX.xml
INFO:root:Scheduling new task: monitor feed downloads for 
http://0install.net/2007/3rd-party/LyX.xml
INFO:root:Task 'solve_with_downloads' stopping and waiting for 
'[<Blocker:monitor feed downloads for 
http://0install.net/2007/3rd-party/LyX.xml>]'
INFO:root:Task 'quitter' stopping and waiting for 
'(<Blocker:solve_with_downloads>,)'
INFO:root:Task 'monitor feed downloads for 
http://0install.net/2007/3rd-party/LyX.xml' stopping and waiting for 
'(<Blocker:fetch_feed http://0install.net/2007/3rd-party/LyX.xml>, 
<Blocker:Mirror timeout>)'
INFO:root:Task 'download_done_stats' stopping and waiting for 
'(<Blocker:download http://0install.net/2007/3rd-party/LyX.xml>,)'
INFO:root:Task 'fetch_feed http://0install.net/2007/3rd-party/LyX.xml' 
stopping and waiting for '(<Blocker:download 
http://0install.net/2007/3rd-party/LyX.xml>,)'
INFO:root:Task 'download http://0install.net/2007/3rd-party/LyX.xml' 
stopping and waiting for '(<Blocker:read data from 
http://0install.net/2007/3rd-party/LyX.xml>,)'
INFO:root:Running set([Task(download 
http://0install.net/2007/3rd-party/LyX.xml)]) due to triggering of 'read 
data from http://0install.net/2007/3rd-party/LyX.xml'
INFO:root:Running set([Task(fetch_feed 
http://0install.net/2007/3rd-party/LyX.xml), Task(download_done_stats)]) 
due to triggering of 'download http://0install.net/2007/3rd-party/LyX.xml'
INFO:root:Scheduling new task: download keys for 
http://0install.net/2007/3rd-party/LyX.xml
INFO:root:Task 'fetch_feed http://0install.net/2007/3rd-party/LyX.xml' 
stopping and waiting for '(<Blocker:download keys for 
http://0install.net/2007/3rd-party/LyX.xml>,)'
INFO:root:Running download_done_stats
INFO:root:Running set([Task(fetch_feed 
http://0install.net/2007/3rd-party/LyX.xml)]) due to triggering of 
'download keys for http://0install.net/2007/3rd-party/LyX.xml'
INFO:root:Exception from 'fetch_feed 
http://0install.net/2007/3rd-party/LyX.xml': [Errno 2] No such file or 
directory: '/var/lib/rpm/Packages'
INFO:root:Running set([Task(monitor feed downloads for 
http://0install.net/2007/3rd-party/LyX.xml)]) due to triggering of 
'fetch_feed http://0install.net/2007/3rd-party/LyX.xml'
INFO:root:Exception from 'monitor feed downloads for 
http://0install.net/2007/3rd-party/LyX.xml': [Errno 2] No such file or 
directory: '/var/lib/rpm/Packages'
INFO:root:Running set([Task(solve_with_downloads)]) due to triggering of 
'monitor feed downloads for http://0install.net/2007/3rd-party/LyX.xml'
WARNING:root:[Errno 2] No such file or directory: '/var/lib/rpm/Packages'
INFO:root:Interface <Interface 
http://0install.net/2007/3rd-party/LyX.xml> has no implementations!
INFO:root:Running set([Task(quitter)]) due to triggering of 
'solve_with_downloads'
Traceback (most recent call last):
   File "/u/8/dgirardi/local/bin/0launch", line 4, in ?
     cli.main(sys.argv[1:])
   File "/u/8/dgirardi/local/lib/python/zeroinstall/injector/cli.py", 
line 359, in main
     _normal_mode(options, args)
   File "/u/8/dgirardi/local/lib/python/zeroinstall/injector/cli.py", 
line 250, in _normal_mode
     policy.download_and_execute(prog_args, refresh = 
bool(options.refresh), main = options.main)
   File 
"/u/8/dgirardi/local/lib/python/zeroinstall/injector/autopolicy.py", 
line 46, in download_and_execute
     raise model.SafeException("Can't find all required 
implementations:\n" +
zeroinstall.SafeException: Can't find all required implementations:
- <Interface http://0install.net/2007/3rd-party/LyX.xml> -> None

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