Myfaces日历控件无法弹出,该如何处理

Myfaces日历控件无法弹出
代码如下：
<x:inputCalendar monthYearRowClass="yearMonthHeader"
weekRowClass="weekHeader" currentDayCellClass="currentDayCell"
renderAsPopup="true" popupTodayString="Today" popupWeekString="Week"
popupDateFormat="yyyy-MM-dd" value="#{userInfoBean.birthDate}">
</x:inputCalendar>

浏览器提示“缺少对象”

[解决办法]
配合结贴，不好意思