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”

需要在web.xml 中配置 
<filter>
  <filter-name>extensionsFilter</filter-name>
  <filter-class>
  org.apache.myfaces.component.html.util.ExtensionsFilter
  </filter-class>

</filter>

和

 <filter-mapping>
  <filter-name>extensionsFilter</filter-name>
  <url-pattern>*.jsf</url-pattern>
 </filter-mapping>
 <filter-mapping>
  <filter-name>extensionsFilter</filter-name>
  <url-pattern>/faces/*</url-pattern>
 </filter-mapping>