Error: kendo.ui.Resizable is not a constructor

[Bruce]

I've integrated a Kendo splitter into SharePoint 2010.  I see the following error in the firebug console:
kendo.ui.Resizable is not a constructor
http://domain/sites/TestDeployment/Pages/_layouts/1033/STYLES/KendoUI/Web/kendo.splitter.js
Line 931

I also find that I'm unable to access my existing splitter using

var splitter = $("#mainArea").data("kendoSplitter");

where #mainArea is the ID of the div where I attached the splitter.  When I try this, I see an error in the firebug console indicating that "splitter is undefined".
$("#mainArea").height() returns the height of the div, and there is a splitter there that otherwise works.

Any ideas?  Please let me know if I can provide any other information that may help.

Thanks.