thanks for the reply.

there is something wrong with the preinstalled ruby gem in my MacOS 
10.5.7
and I always get the 403 error:

sudo gem sources -a http://gemcutter.org
ERROR:  While executing gem ... (Gem::RemoteSourceException)
    HTTP Response 403 fetching http://gemcutter.org/yaml

--junmin

Nathan Beyer wrote:
> There's been a recent move of gems to http://gemcutter.org/. The
> RubyForge gems server is supposed to continue working, but if you want
> to move, you can do the following.
> 
> sudo gem sources list
> # lists all source servers
> 
> sudo gem sources -a http://gemcutter.org/
> # adds gemcutter to sources
> 
> sudo gem sources -r http://gems.rubyforge.org/
> # if you want to clean up the old source, then remove it
> 
> sudo gem update --system
> # try the update again

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