OcurriĆ³ un Error con la Base de Datos

Error Number: 1327

Undeclared variable: contacto

SELECT cu.url, ca.* FROM cms_articulo AS ca, cms_url AS cu WHERE ca.idioma='es' AND ca.idioma=cu.idioma AND ca.id=cu.id_contenido AND modulo = 'mod_articulo' ORDER BY id DESC LIMIT contacto,5

Filename: /home/jymmine/public_html/models/articulo.php

Line Number: 36