passenger error

irb session

ruby-1.8.7-p334 :001 > rvm_path     = File.dirname(File.dirname(ENV['MY_RUBY_HOME']))
 => "/home/mpapis/.rvm" 
ruby-1.8.7-p334 :002 > rvm_lib_path = File.join(rvm_path, 'lib')
 => "/home/mpapis/.rvm/lib" 
ruby-1.8.7-p334 :003 > $LOAD_PATH.unshift rvm_lib_path
 => ["/home/mpapis/.rvm/lib", "/home/mpapis/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8", "/home/mpapis/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby/1.8/i686-linux", "/home/mpapis/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/site_ruby", "/home/mpapis/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/vendor_ruby/1.8", "/home/mpapis/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/vendor_ruby/1.8/i686-linux", "/home/mpapis/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/vendor_ruby", "/home/mpapis/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/1.8", "/home/mpapis/.rvm/rubies/ruby-1.8.7-p334/lib/ruby/1.8/i686-linux", "."] 
ruby-1.8.7-p334 :004 > RVM.current
NameError: uninitialized constant RVM
	from (irb):4
ruby-1.8.7-p334 :005 > require 'rvm'
 => true 
ruby-1.8.7-p334 :006 > RVM.current
 => #<RVM::Environment environment_name="ruby-1.8.7-p334"> 
ruby-1.8.7-p334 :007 > RVM.use! '1.8.7@icat'
 => nil 
ruby-1.8.7-p334 :008 > RVM.current
 => #<RVM::Environment environment_name="1.8.7@icat">