[twitter-dev] DM via curl?

[TjL]

http://apiwiki.twitter.com/Twitter-REST-API-Method%3A-direct_messages%C2%A0new?SearchFor=direct+message&sp=4

gives this example:

# curl -u user:password -d "text=all your bases are belong to
use&user=user_2" http://twitter.com/direct_messages/new.xml

I tried this

# curl -u "luomat:PASSWORD" -d "text=test&user=tj"
http://twitter.com/direct_messages/new.xml

and got this

<?xml version="1.0" encoding="UTF-8"?>
<hash>
  <request>/direct_messages/new.xml</request>
  <error>Invalid request.</error>
</hash>

Am I missing something?