i am getting errors when run these commands...........

XXXXXXXXXX:~/.coupa-1.5#gem list *** LOCAL GEMS ***

actionmailer (2.3.8) actionpack (2.3.8) activerecord (2.3.8) activeresource (2.3.8) activesupport (2.3.8) acts_as_ferret (0.4.1) daemons (1.0.10) gem_plugin (0.2.3) gemsonrails (0.7.2) minitest (1.6.0) mongrel (1.2.0.pre2) mysql (2.8.1) rack (1.1.0) rails (2.3.8) rake (0.8.7) rdoc (2.5.8) rtf (0.1.0) rubygems-update (1.3.7) rvm (0.1.45) sdsykes-ferret (0.11.6.19) test-unit (2.1.1) vpim (0.695)

XXXXXXXXX:~/.coupa-1.5# mongrel_rails start ** Starting Mongrel listening at 0.0.0.0:3000 ** Starting Rails with development environment... Your config/boot.rb is outdated: Run "rake rails:update".

XXXXXXXXX:~/.coupa-1.5# rake rails:update (in /root/.coupa-1.5) DEPRECATION WARNING: Rake tasks in vendor/plugins/backgroundrb/tasks, vendor/plugins/blueprint/tasks, vendor/plugins/coupa_engine/tasks, vendor/plugins/deprecated/tasks, vendor/plugins/engines/tasks, vendor/ plugins/human_attribute_override/tasks, vendor/plugins/scoped_access/ tasks, vendor/plugins/selenium-on-rails/tasks, and vendor/plugins/ user_engine/tasks are deprecated. Use lib/tasks instead. (called from <top (required)> at /usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.8/ lib/tasks/rails.rb:10) rake aborted! no such file to load -- yaml/encoding /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.8/lib/ active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.8/lib/ active_support/dependencies.rb:156:in `block in require' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.8/lib/ active_support/dependencies.rb:521:in `new_constants_in' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.8/lib/ active_support/dependencies.rb:156:in `require' /root/.coupa-1.5/vendor/plugins/coupa_engine/tasks/coupa_engine.rake: 31:in `block (2 levels) in <top (required)>' /usr/local/lib/ruby/1.9.1/rake.rb:1874:in `in_namespace' /usr/local/lib/ruby/1.9.1/rake.rb:908:in `namespace' /root/.coupa-1.5/vendor/plugins/coupa_engine/tasks/coupa_engine.rake: 21:in `block in <top (required)>' /usr/local/lib/ruby/1.9.1/rake.rb:1874:in `in_namespace' /usr/local/lib/ruby/1.9.1/rake.rb:908:in `namespace' /root/.coupa-1.5/vendor/plugins/coupa_engine/tasks/coupa_engine.rake: 17:in `<top (required)>' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.8/lib/ active_support/dependencies.rb:145:in `load' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.8/lib/ active_support/dependencies.rb:145:in `block in load_with_new_constant_marking' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.8/lib/ active_support/dependencies.rb:521:in `new_constants_in' /usr/local/lib/ruby/gems/1.9.1/gems/activesupport-2.3.8/lib/ active_support/dependencies.rb:145:in `load_with_new_constant_marking' /usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.8/lib/tasks/rails.rb: 11:in `block in <top (required)>' /usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.8/lib/tasks/rails.rb: 11:in `each' /usr/local/lib/ruby/gems/1.9.1/gems/rails-2.3.8/lib/tasks/rails.rb: 11:in `<top (required)>' /root/.coupa-1.5/Rakefile.rb:10:in `require' /root/.coupa-1.5/Rakefile.rb:10:in `<top (required)>' /usr/local/lib/ruby/1.9.1/rake.rb:2373:in `load' /usr/local/lib/ruby/1.9.1/rake.rb:2373:in `raw_load_rakefile' /usr/local/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile' /usr/local/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling' /usr/local/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefile' /usr/local/lib/ruby/1.9.1/rake.rb:1991:in `run' /usr/local/bin/rake:31:in `<main>'

if i run any rake command i get same errors...................................