Ruby on Rails

I'm trying to figure out how I can setup my own forums using Ruby, but I
can't get passed installing "nifty-generators"... I haven't a clue how
to install the gems... Please tell me what I'm doing wrong?

I open the command prompt, I type in :

gem install nifty-generators

And this is what I get:

Successfully installed nifty-generators-0.4.6
1 gem installed
Installing ri documentation for nifty-generators-0.4.6...
ERROR: While generating documentation for nifty-generators-0.4.6
... MESSAGE: Invalid argument - ./</cdesc-<.ri
... RDOC args: --ri --op
C:/Ruby193/lib/ruby/gems/1.9.1/doc/nifty-generators-0.4
.6/ri lib --title nifty-generators-0.4.6 Documentation --quiet

Pleassse help...

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