Assigning the return value of new by reference is deprecated

hey, i have an error in m ywordpress backend:

Deprecated: Assigning the return value of new by reference is deprecated in /home/www/…/wp-content/plugins/option-tree/includes/ot-meta-box-api.php on line 279

you should change
$ot_meta_box =& new OT_Meta_Box( $args );

to
$ot_meta_box = new OT_Meta_Box( $args );

http://wordpress.org/extend/plugins/option-tree/