Rails - Aug 2010 - [RE][RE][RE] i am getting errors when run these commands...........

I am using ubuntu 10.04.1 .............
I want to run my coupa application

all required gems FOR COUPA-1.5 are

1. gem install rails –v 1.2.3 ------------------------------  But i have
installed gem install rails (2.3.8)
2. gem install ferret –v 0.11.4 ------------------------------  But i have
installed gem install sdsykes-ferret (0.11.6.19)
3. gem install -y -v 0.4.1 acts_as_ferret
4. gem install rtf
5. gem install mysql
6. gem install vpim
7. gem install rake –v 0.7.3
8. gem install mongrel
9. gem uninstall rake –v 0.8.1 (or any other version of rake that is
currently
on your system. Type “gem list” to see all gems and their version)

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Your config/boot.rb is outdated: Run "rake rails:update".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...................................

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