为啥模板一直报错，有的页面显示不出来 - JEECMS官方论坛|开源java cms,jsp cms,jsp bbs

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1# 发表于:2017-03-01 18:37:04 IP:211.178.*.*

严重: Servlet.service() for servlet [JeeCmsFront] in context with path [/jeecms] threw exception [Request processing failed; nested exception is freemarker.core._TemplateModelException: An error has occurred when reading existing sub-variable "url"; see cause exception! The type of the containing value was: extended_hash+string (com.jeecms.cms.entity.main.Channel wrapped into f.e.b.StringModel)

----
FTL stack trace ("~" means nesting-related):
- Failed at: ${c.url}  [in template "WEB-INF/t/cms/www/default/include/nav.html" at line 20, column 26]
- Reached through: @cms_channel_list  [in template "WEB-INF/t/cms/www/default/include/nav.html" at line 2, column 6]
- Reached through: #include "../include/nav.html"  [in template "WEB-INF/t/cms/www/default/include/header.html" at line 19, column 5]
- Reached through: #include "../include/header.html"  [in template "WEB-INF/t/cms/www/default/index/index.html" at line 28, column 1]
----] with root cause
java.lang.NullPointerException