Can't build a package

[Shamaoke]

Hi.

When trying to build Scripty I get the NameError exception.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
$ rake && rake package

(in /home/<username>/development/ruby/scripty2)
rm -rf /home/<username>/development/ruby/scripty2/dist
mkdir /home/<username>/development/ruby/scripty2/dist
mkdir /home/<username>/development/ruby/scripty2/dist/debug
mkdir /home/<username>/development/ruby/scripty2/dist/release
Sprocketizing (s2.js)...
rake aborted!
uninitialized constant Sprockets::Secretary
<...>
/home/<username>/development/ruby/scripty2/Rakefile:38:in
`sprocketize'
<...>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

How can I tackle with the issue?

Thanks.

Debian GNU/Linux 5.0.6;

Ruby 1.9.2;

Sprockets 2.0.0.beta.10;

Scripty #a65396e.