Myfaces年历控件无法弹出

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