Page not found (404)

Request Method: GET
Request URL: http://libreria.uimunicipalistas.org/91/metodos-y-herramientas-de-mejora-aplicados-en-la-administracion-publica
Raised by: utils.decoradores.wrapper

No Libro matches the given query.

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.