ActiveAdmin string primary key error

gistfile1.txt

  SQL (0.6ms)  SELECT COUNT(*) FROM "active_admin_comments" WHERE "active_admin_comments"."namespace" = 'admin' AND ("active_admin_comments".resource_id = 'xksS5NjE' AND "active_admin_comments".resource_type = 'Gift')
PGError: ERROR:  invalid input syntax for integer: "xksS5NjE"
LINE 1: ...admin' AND ("active_admin_comments".resource_id = 'xksS5NjE'...
                                                             ^
: SELECT COUNT(*) FROM "active_admin_comments" WHERE "active_admin_comments"."namespace" = 'admin' AND ("active_admin_comments".resource_id = 'xksS5NjE' AND "active_admin_comments".resource_type = 'Gift')
Rendered /Users/mabner/.rvm/gems/ruby-1.9.2-p180@china/gems/activeadmin-0.2.1/lib/active_admin/views/templates/active_admin_default/show.html.arb (1411.4ms)
Completed   in 2329ms

ActionView::Template::Error (PGError: ERROR:  invalid input syntax for integer: "xksS5NjE"
LINE 1: ...admin' AND ("active_admin_comments".resource_id = 'xksS5NjE'...
                                                             ^
: SELECT COUNT(*) FROM "active_admin_comments" WHERE "active_admin_comments"."namespace" = 'admin' AND ("active_admin_comments".resource_id = 'xksS5NjE' AND "active_admin_comments".resource_type = 'Gift')):
    1: render renderer_for(:show)
  

Rendered /Users/mabner/.rvm/gems/ruby-1.9.2-p180@china/gems/actionpack-3.0.6/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.0ms)
Rendered /Users/mabner/.rvm/gems/ruby-1.9.2-p180@china/gems/actionpack-3.0.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (10.2ms)
Rendered /Users/mabner/.rvm/gems/ruby-1.9.2-p180@china/gems/actionpack-3.0.6/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (14.5ms)