Upgrading Redmine from 1.2.2 to 2.0.2

I needed to upgrade a Redmine installation that was pretty old to the newest release 2.0.2. I was following this document on how to upgrade Redmine http://www.redmine.org/projects/redmine/wiki/RedmineUpgrade. When I got to Step 4 - Update the database

I received the following error

root@xxx #rake db:migrate RAILS_ENV=production --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
no such file to load -- dispatcher
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:251:in `block in require'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:236:in `load_dependency'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:251:in `require'
/vol/www/sites/redmine2.appinux.com/plugins/redmine_scm/init.rb:2:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:251:in `require'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:251:in `block in require'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:236:in `load_dependency'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:251:in `require'
/vol/www/sites/redmine2.appinux.com/lib/redmine/plugin.rb:129:in `block in load'
/vol/www/sites/redmine2.appinux.com/lib/redmine/plugin.rb:120:in `each'
/vol/www/sites/redmine2.appinux.com/lib/redmine/plugin.rb:120:in `load'
/vol/www/sites/redmine2.appinux.com/config/initializers/30-redmine.rb:13:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:245:in `load'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:245:in `block in load'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:236:in `load_dependency'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.2.5/lib/active_support/dependencies.rb:245:in `load'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/engine.rb:588:in `block (2 levels) in <class:Engine>'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/engine.rb:587:in `each'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/engine.rb:587:in `block in <class:Engine>'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/initializable.rb:30:in `instance_exec'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/initializable.rb:30:in `run'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/initializable.rb:55:in `block in run_initializers'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/initializable.rb:54:in `each'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/initializable.rb:54:in `run_initializers'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/application.rb:136:in `initialize!'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/railtie/configurable.rb:30:in `method_missing'
/vol/www/sites/redmine2.appinux.com/config/environment.rb:14:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/application.rb:103:in `require'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/application.rb:103:in `require_environment!'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/railties-3.2.5/lib/rails/application.rb:292:in `block (2 levels) in initialize_tasks'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `each'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/usr/local/rvm/gems/ruby-1.9.2-p180/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.2-p180/bin/rake:19:in `load'
/usr/local/rvm/gems/ruby-1.9.2-p180/bin/rake:19:in `<main>'
Tasks: TOP => db:migrate => environment 

This was solved by removing the redmine_scm plugin that I copied to the plugin folder in Step 3 - Perform the upgrade - Option 1 - Downloaded release (tar.gz or zip file)