Redmine

Hi,

i've just upgraded redmine to 1.2 following the wiki
http://www.redmine.org/projects/redmine/wiki/RedmineUpgrade

everything runs ok except when adding or editing issues, documents, wiki, etc..
i've got a redmine 500 error : undefined method `unsaved_attachments' for #<Issue:0x7f949387fa08>

when i go back to the issues list, the issue had been created and files are uploaded ok

any idea ?

thanks in advance
Regards

Application trace:

/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/attribute_methods.rb:260:in `method_missing'
/usr/share/redmine-1.2/app/models/attachment.rb:161:in `attach_files'
/usr/share/redmine-1.2/app/controllers/issues_controller.rb:140:in `create'

Log:

NoMethodError (undefined method `unsaved_attachments' for #<Issue:0x7f10fd8be290>):
  app/models/attachment.rb:161:in `attach_files'
  app/controllers/issues_controller.rb:140:in `create'
  /usr/lib/ruby/1.8/mongrel.rb:159:in `process_client'
  /usr/lib/ruby/1.8/mongrel.rb:158:in `each'
  /usr/lib/ruby/1.8/mongrel.rb:158:in `process_client'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `run'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `initialize'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `new'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `run'
  /usr/lib/ruby/1.8/mongrel.rb:268:in `initialize'
  /usr/lib/ruby/1.8/mongrel.rb:268:in `new'
  /usr/lib/ruby/1.8/mongrel.rb:268:in `run'

Rendering rescues/layout (internal_server_error)

application's environment:

Ruby version              1.8.7 (x86_64-linux)
RubyGems version          1.3.5
Rack version              1.1.1
Rails version             2.3.11
Active Record version     2.3.11
Active Resource version   2.3.11
Action Mailer version     2.3.11
Active Support version    2.3.11
Application root          /usr/share/redmine-1.2
Environment               production
Database adapter          mysql
Database schema version   20110511000000