_updateDifferenceMatrix has been renamed _updateAbsoluteBindMatrices lately.
Sorry if this broke some of your code, but this method is an internal method that is not intended to be called by end users, so we can change the name / signature of such methods without notification.
he @Evgeni_Popov i guess some parametare be replaced on final function ( ** rooturl ) may be not filled in Gltf Loader ( i used the url for loader ) but for now i use older version
if that happend for me that can be happend in other project too