Error: Page not found

Install and active the plugin normally. I insert the shortcode [lost_found] and created a page with the name of the lost and found.
http://www.tucuruiense.com/servicos/achados-e-perdidos/

However, when I click one of the items says that the page was not found.

If eestou logged in as administrator or not, gives plumb error. What’s going on?

http://wordpress.org/plugins/the-lost-and-found/