fields not save change in ordering, fields.php line 75

Unable to properly re-order fields. Error at apache log shown below.

Under type, fields problem re-ordering. Log:

Declaration of CobaltControllerField::postSaveHook() should be compatible with JControllerform::postsaveHook(JModelLegacy $model, $validData = Array) in administrator/components/com_cobalt/controllers/field.php line 75

Joomla 3.1.1, PHP 5.4.17, Apache 2.4.4, MySQL 5.5.32

Wonderin if maybe related with this:

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit& ;tracker_item_id=28819