RM complains that 'Some of the required gems are not attached' - specifically i18n, of which I have 0.2.0 but not 0.1.3 which rubymine is asking for. Attempts to install i18n 'sudo gem install i18n -v 0.1.3' do not work. I can continue to 'hide' this complaint but that doesn't sit well with me. What should I do??