[@cms_channel_list parentId=channel.parent.id count='10' tpl='0'] 读取子栏目这样写为什么会报错

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1# 发表于:2015-01-22 09:37:11 IP:124.194.*.*

[@cms_channel_list parentId=channel.parent.id count='10' tpl='0'] 读取子栏目这样写为什么会报错
2015-1-22 9:31:45 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [JeeCmsFront] in context with path [/jeecms] threw exception [Request processing failed; nested exception is freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> channel.parent  [in template "WEB-INF/t/cms/www/default/channel/serve.html" at line 86, column 69]

Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use [#if myOptionalVar??]when-present[#else]when-missing[/#if]. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)??

The failing instruction:
==> @cms_channel_list parentId=channel.pa...  [in template "WEB-INF/t/cms/www/default/channel/serve.html" at line 86, column 41]] with root cause
FreeMarker template error:
The following has evaluated to null or missing:
==> channel.parent  [in template "WEB-INF/t/cms/www/default/channel/serve.html" at line 86, column 69]

Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use [#if myOptionalVar??]when-present[#else]when-missing[/#if]. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)??

The failing instruction (FTL stack trace):
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==> @cms_channel_list parentId=channel.pa...  [in template "WEB-INF/t/cms/www/default/channel/serve.html" at line 86, column 41]
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Java stack trace (for programmers):
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