Sections must only appear once per config file. See the help topic <location> for exception
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Sections must only appear once per config file. See the help topic <location> for exceptions. 提示节点只能出现一次在配置文件，即是有重复出现。
因为在处理发布的时候将
<system.web>
<customErrors mode="Off"/>
</system.web>
拷贝到了web.config配置文件下导致多了一个相同的节点<system.web></system.web>。如果出现此错误的话请检查当前的配置文件是不是存在相同的节点，删除即可。
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