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I have deleted the plugin and everything is ok.

This is the trace:

Started POST "/projects/gatatac-web/issues" for 127.0.0.1 at 2013-11-21 18:33:29 +0000
Processing by IssuesController#create as HTML
  Parameters: {"utf8"=>"?", "authenticity_token"=>"blablabla", "issue"=>{"is_private"=>"0", "tracker_id"=>"1", "subject"=>"Notificaciones crash", "description"=>"", "status_id"=>"1", "priority_id"=>"2", "assigned_to_id"=>"", "fixed_version_id"=>"", "parent_issue_id"=>"", "start_date"=>"2013-11-21", "due_date"=>"", "estimated_hours"=>"", "done_ratio"=>"0"}, "commit"=>"Crear", "project_id"=>"gatatac-web"}
  Current user: txinto (id=3)
Completed 500 Internal Server Error in 143.1ms

ArgumentError (wrong number of arguments (3 for 1)):
  app/models/mailer.rb:422:in `initialize'
  app/models/mailer.rb:445:in `method_missing'
  app/models/mailer.rb:52:in `block in deliver_issue_add'
  app/models/issue.rb:821:in `each_notification'
  app/models/mailer.rb:51:in `deliver_issue_add'
  app/models/issue.rb:1514:in `send_notification'
  app/models/issue.rb:163:in `create_or_update'
  app/controllers/issues_controller.rb:146:in `create'