From: Aya Abdelsalam Date: 2011-09-21T06:19:02+09:00 Subject: Re: I am confused with installing a gem This is the error message that appears on the command prompt C:\Users\User> gem install classifier ERROR: Could not find a valid gem 'classifier' (>= 0) in any repository ERROR: Possible alternatives: classifier -- Posted via http://www.ruby-forum.com/.