rubygems - Error while installing neo4j ruby gem -

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when run 'gem install neo4j'

i error:

while executing gem ... (argumenterror)     malformed format string - %)

what mean?? there problem source of gem? happen else? installed rvm today, it?

jruby -s gem install neo4j worked me, https://github.com/jruby/jruby/wiki/gettingstarted#installing-and-using-ruby-gems


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