erreur plugin champ extra

**Après la création de champs EXTRA avec le plugin champs extra, j'ai cette erreur:**
**Erreur SQL**
U.url, U.date, O. FROM spip_articles AS O LEFT JOIN spip_urls AS U ON (U.type='article' AND U.id_objet=O.id_article) WHERE O.id_article=17 ORDER BY U.date DESC LIMIT 1
**You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FROM user7119_useref.useref_articles AS O LEFT JOIN user7119_useref.useref_u' at line 2**

**Que faire?**

**RP**