Janus developers pulled my changes so if you checkout the latest code you won't see this problem.
Janus is a basic distribution of vim plugins and tools intended to be run on top of the latest MacVIM snapshot.
I tried to install it today but i got this 'unable to determine script type' error
I opened the Rakefile and figured out that the problem is that the vim.org/scripts does not response.
I looked for mirrors and found one on github, git://github.com/vim-scripts/
I replaced all the vim.org lines with github.com/vim-scripts, it seems working now.
Here is the diff for the Rakefile