I have this problem win Rubygem

I don't now what to do
rubygems-0.9.4


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/usr/lib/ruby/site_ruby/1.8/rubygems.rb:84:Warning: require_gem is
obsolete.  Use gem instead.
/usr/lib/ruby/site_ruby/1.8/rubygems.rb:76:in `active_gem_with_options':
undefined method `activate' for Gem:Module (NoMethodError)
        from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:61:in `require'
        from /usr/lib/ruby/site_ruby/1.8/rubygems.rb:84
        from /var/lib/asterisk/agi-bin/comprobar-festivos.rb:17:in
`require'
        from /var/lib/asterisk/agi-bin/comprobar-festivos.rb:17
    -- AGI Script comprobar-festivos.rb completed, returning 0
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