Error message

Warning: Invalid argument supplied for foreach() in element_children() (line 6525 of /var/www/artbabble.org/drupal/includes/common.inc).
Warning: Illegal string offset '#children' in drupal_render() (line 5982 of /var/www/artbabble.org/drupal/includes/common.inc).
Warning: Illegal string offset '#children' in drupal_render() (line 5992 of /var/www/artbabble.org/drupal/includes/common.inc).
Warning: Illegal string offset '#children' in drupal_render() (line 6030 of /var/www/artbabble.org/drupal/includes/common.inc).
Warning: Illegal string offset '#printed' in drupal_render() (line 6037 of /var/www/artbabble.org/drupal/includes/common.inc).