no amigo mira...
Código PHP:
ALTER TABLE `empleado`
ADD CONSTRAINT `FK_idArea` FOREIGN KEY (`idArea`) REFERENCES `area` (`idArea`) ON UPDATE CASCADE ON DELETE SET NULL;
/* SQL Error (1005): Can't create table 'touche.#sql-340_1' (errno: 150)
Foreign key constraint is incorrectly formed */
sigue sacando el error alguna idea?