warnings when executing irb

[t0d0r]

irb

LoadError: no such file to load -- added_methods [/Users/t0d0r/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:58:in `require']
LoadError: no such file to load -- backports [/Users/t0d0r/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:58:in `require']
LoadError: no such file to load -- what_methods [/Users/t0d0r/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:58:in `require']

my .irbrc

require 'irb/ext/save-history'

IRB.conf[:SAVE_HISTORY] = 100
IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-save-history"

require 'rubygems'
require 'brice/init'

# IRB Options
IRB.conf[:AUTO_INDENT] = true

[t0d0r]

duplicate previous close issue, sorry