What's matter with fastri?

pt@pt-laptop:~$ sudo gem install fastercsv
Successfully installed fastercsv-1.5.3
1 gem installed
Installing ri documentation for fastercsv-1.5.3…
Updating class cache with 1729 classes…
Installing RDoc documentation for fastercsv-1.5.3…
pt@pt-laptop:~$ fri Date
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/lib/fastri/util.rb:38:in
require': no such file to load -- rdoc/ri/ri_paths (LoadError) from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/lib/fastri/util.rb:38:in<top (required)>’
from
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/bin/fri:6:in
require' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/bin/fri:6:in<top (required)>’
from /usr/local/ruby/bin/fri:19:in load' from /usr/local/ruby/bin/fri:19:in
pt@pt-laptop:~$
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/bin/fri Date
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/lib/fastri/util.rb:38:in
require': no such file to load -- rdoc/ri/ri_paths (LoadError) from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/lib/fastri/util.rb:38:in<top (required)>’
from
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/bin/fri:6:in
require' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/bin/fri:6:in
pt@pt-laptop:~$ fri each_with_index
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/lib/fastri/util.rb:38:in
require': no such file to load -- rdoc/ri/ri_paths (LoadError) from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/lib/fastri/util.rb:38:in<top (required)>’
from
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/bin/fri:6:in
require' from /usr/local/ruby/lib/ruby/gems/1.9.1/gems/fastri-0.3.1.1/bin/fri:6:in<top (required)>’
from /usr/local/ruby/bin/fri:19:in load' from /usr/local/ruby/bin/fri:19:in

On Apr 6, 2010, at 22:17 , Pen T. wrote:

pt@pt-laptop:~$ sudo gem install fastercsv
Successfully installed fastercsv-1.5.3
1 gem installed
Installing ri documentation for fastercsv-1.5.3…
Updating class cache with 1729 classes…
Installing RDoc documentation for fastercsv-1.5.3…
pt@pt-laptop:~$ fri Date

I assume ri Date works fine, yes?