freemarker嵌套循环怎么写

         下面是JSP页面代码

/c:forEach
/c:forEach
这是我根据以上写的ftl(freemarker 标签写的)
<#if typeProList?exists>
<#list typeProList[0..0] as each>
<#list each.proList[0..1] as product>

</#list>
</#list>
</#if>

但是报错：list each.proList[0..1] as product [on line 24, column 37 in probottom.ftl]