ariel\core\error [2]: Invalid argument supplied for foreach()

0 # /srv/lighttpd/incaa.fr/www/templates/projects/view.php - 15
(ariel\core\handler)error

1 # /srv/lighttpd/incaa.fr/www/lib/component/view.php - 70
include

2 # /srv/lighttpd/incaa.fr/www/public/index.php - 60
(ariel\component\View)render