<s:optiontransferselect 的错

Question

<form>
    <s:optiontransferselect name="study" list="{'吉林','长春'}" doubleName="apart" 
    doubleList="{'北京','上海','深圳'}" leftTitle="三扬培训"　rightTitle="三扬就业" headerKey="first"
    headerValue="第一个列表框头信息" emptyOption="true" doubleEmptyOption="true"
    doubleHeaderKey="second" doubleHeaderValue="第二个列表框头信息" allowAddToLeft="true"
    addToLeftLabel="左移" allowAddToRight="true" addToRightLabel="右移"
     allowAddAllToRight="true" addAllToLeftLabel="全部左移" allowAddAllToRight="true"
    addAllToRightLabel="全部右移" selectAllLabel="全选" multiple="true" doubleMultiple="true"/>
 </form>以上代码报错如下：页面org.apache.jasper.JasperException: /optiontransferselect.jsp(22,50) Unterminated &lt;s:optiontransferselect tag
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:132)
org.apache.jasper.compiler.Parser.parseOptionalBody(Parser.java:964)
org.apache.jasper.compiler.Parser.parseCustomTag(Parser.java:1242)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1418)
org.apache.jasper.compiler.Parser.parse(Parser.java:130)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:185)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:347)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:589)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:389)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.26 logs.TOMACT中报错如下：2012-4-29 11:05:26 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
警告: form enclosing optiontransferselect org.apache.struts2.components.OptionTransfe
rSelect@bed4c8 not found, auto select upon form submit of optiontransferselect will n
ot work
2012-4-29 11:05:34 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
警告: form enclosing optiontransferselect org.apache.struts2.components.OptionTransfe
rSelect@dd7786 not found, auto select upon form submit of optiontransferselect will n
ot work
2012-4-29 11:09:36 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
警告: form enclosing optiontransferselect org.apache.struts2.components.OptionTransfe
rSelect@1537060 not found, auto select upon form submit of optiontransferselect will
not work
2012-4-29 11:10:46 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
警告: form enclosing optiontransferselect org.apache.struts2.components.OptionTransfe
rSelect@9fe666 not found, auto select upon form submit of optiontransferselect will n
ot work
2012-4-29 11:12:21 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
警告: form enclosing optiontransferselect org.apache.struts2.components.OptionTransfe
rSelect@499f7d not found, auto select upon form submit of optiontransferselect will n
ot work什么情况啊？