Question about upgrade to jQueryUI 1.10 - more is needed in the Autocomplete upgrade guide

Question about upgrade to jQueryUI 1.10 - more is needed in the Autocomplete upgrade guide

In Autocomplete, I have changed item.autocomplete to ui-autocomplete-item in all instances. That is the only Autocomplete change stated in the Upgrade Guide.  I use the _renderItem() method.  I also use logic inside the ajax response to populate the dropdown list.

Everything works in UI 1.9,  but the page will not load using UI 1.10.  In the Console, I get the error