Redmine

After install the plugin and setting some plugin parameters, I am trying to export task and when I select the "Export issue" button I get a message error

Page not found
The page you were trying to access doesn't exist or has been removed.
Back

I install the plugin http://www.redmine.org/plugins/redmine-msp-sync version 0.3 and these are my environment info:

Environment:
Redmine version: 2.4.3.stable
Ruby version: 1.9.3-p484 (2013-11-22) [x86_64-darwin10.0.0]
Rails version: 3.2.16
Environment: production
Database adapter: Mysql2

The log file /apps/redmine/htdocs/log/production.log show me:

Started GET "/redmine/projects/ID000001/loader/export?utf8=%E2%9C%93&export=Export+Issue" for XXX.XXX.XXX.XXX at 2015-01-24 13:48:24 -0600
Processing by LoaderController#export as HTML
Parameters: {"utf8"=>"✓", "export"=>"Export Issue", "project_id"=>"co04"}
Current user: usuario at gmail.com (id=10)
Completed 404 Not Found in 6.9ms

ActionController::RoutingError (No route matches "http://XXX.XXX.XXX.XXX:8080/redmine/projects/ID000001/loader/new"):
actionpack (3.2.16) lib/action_dispatch/routing/route_set.rb:642:in `recognize_path'
plugins/redmine_loader/lib/concerns/export.rb:7:in `generate_xml'
plugins/redmine_loader/app/controllers/loader_controller.rb:121:in `export'
actionpack (3.2.16) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.16) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.16) lib/action_controller/metal/rendering.rb:10:in `process_action'

I appreciate your help If someone know about the issue or has the same problem and the solution

Regards