Can't delete attachment file in issues? plugin error?

Production.log -->

ActionController::MethodNotAllowed (Only post and delete requests are allowed.):
  config/initializers/mongrel_cluster_with_rails_211_fix.rb:62:in `dispatch_cgi'

I install bitnami-redmine-1.4.0-0-windows-installer

I can't delete attachment file.  Repetitive logs are shown.
How delete aattachment file in issues?
Can't delete attachment file in issues?
