error 500 "Layout list not found" on manage an ad

Hi,

I'm testing social ads with joomla 3.1, it works correctly but when I go to manage an ad, I get a 500 error and message "Layout list not found", you know that this is so?

you can see the 500 error here: http://linknjob.es/anunciate-es-gratis/gestionar-anuncios

thanks
Manuel