NB: it is now called gem server (no underscore)
I performed a gem update then the gem server worked.
$ gem update --system$ gem server
gems are Ruby libraries that add functionality to the basic install.
NB:
Some gems require you to build the documentation. in this case cd to the gem location and call
$rake docs
or
$rake rdocs
you can view a gems doc directly by pasting the gem docs folder into your web browser.
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