Unrecognized expression with jquery ui select plugin

Question

I am using jquery 1.8.1 and am getting the following error below. It is related to the jquery ui select plugin and originates from the second code snippet.

Uncaught Error: Syntax error, unrecognized expression: li:not(.ui-selectmenu-group).slice(1,2) 

jquery-ui-select.js

.bind('mouseout.selectmenu blur.selectmenu', function() {
    if ($(this).is(self._selectedOptionLi().selector)) { //<-- Originates here
        $(this).addClass(activeClass);
    }
    $(this).removeClass(self.widgetBaseClass + '-item-focus ui-state-hover');
});

Answer 1

Try upgrading to the latest version of Selectmenu. This resolved the issue for me when I upgraded our site to the latest jQuery release (1.8.3). Seems like some old code in the selectmenu API that just never worked, and when upgrading jQuery, it starts throwing errors.