Redmine

Hello,
I upgraded my redmine version yesterday, and today I tried to install some redmine plugins, but I have a probleme with every one :

1) the redmine page on my browser says :

« localhost » a refusé la connexion.

Les causes probables du problème sont

• un service n'est pas démarré ou
• le numéro de port 9000 est erroné.

2) when I execute the command : rake db:migrate_plugins RAILS_ENV=production , I get the message :

rake aborted!
uninitialized constant ActionView::TemplateFinder

(See full trace by running task with --trace)

3) in the logfile I found (for example for stuff to do plugin) :

• Daemonized, any open files are closed. Look at tmp/pids/mongrel.9000.pid and log/mongrel.9000.log for info.
• Starting Mongrel listening at 127.0.0.1:9000
• Initiating groups for "redmine2":"www-data".
• Changing group to "www-data".
• Changing user to "redmine2".
• Starting Rails with production environment...
  /home/redmine2/redmine/config/../vendor/rails/railties/lib/rails/gem_dependency.rb:119:Warning: Gem::Dependency#version_requirements is deprecated and will be removed on or after August 2010. Use #requirement
  /home/redmine2/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:440:in `load_missing_constant': uninitialized constant ActionView::TemplateFinder (NameError)
  from /home/redmine2/redmine/vendor/rails/activesupport/lib/active_support/dependencies.rb:80:in `const_missing'
  from /home/redmine2/redmine/config/../vendor/plugins/engines/lib/engines/plugin.rb:92:in `add_plugin_view_paths'
  from /home/redmine2/redmine/config/../vendor/plugins/engines/lib/engines/plugin.rb:78:in `load'
  from /home/redmine2/redmine/config/../vendor/rails/railties/lib/rails/plugin/loader.rb:38:in `load_plugins'
  from /home/redmine2/redmine/config/../vendor/rails/railties/lib/rails/plugin/loader.rb:37:in `each'
  from /home/redmine2/redmine/config/../vendor/rails/railties/lib/rails/plugin/loader.rb:37:in `load_plugins'
  from /home/redmine2/redmine/config/../vendor/rails/railties/lib/initializer.rb:369:in `load_plugins'
  from /home/redmine2/redmine/config/../vendor/rails/railties/lib/initializer.rb:165:in `process'
  from /home/redmine2/redmine/config/../vendor/rails/railties/lib/initializer.rb:113:in `send'
  from /home/redmine2/redmine/config/../vendor/rails/railties/lib/initializer.rb:113:in `run'
  from /home/redmine2/redmine/config/environment.rb:20
  from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
  from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/rails.rb:147:in `rails'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:113:in `cloaker_'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:149:in `call'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:149:in `listener'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:99:in `cloaker_'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:50:in `call'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/configurator.rb:50:in `initialize'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:84:in `new'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:84:in `run'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/command.rb:212:in `run'
  from /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
  from /usr/bin/mongrel_rails:19:in `load'
  from /usr/bin/mongrel_rails:19

Can somebody help me ?
Thanks