二级网址 web.confing 怎么配置

Server Error in '/' Application.
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Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level.  This error can be caused by a virtual directory not being configured as an application in IIS.

Source Error:

Line 17:
Line 18:
Line 19:     <sessionState timeout="30"/>
Line 20:     
Line 28:    <authentication mode="Windows"/>
Line 29: <!--
Line 30:             如果在执行请求的过程中出现未处理的错误，

--------------------编程问答-------------------- iis里面采用主机头，每个网站都是一个应用程序，不能只是虚拟目录 --------------------编程问答-------------------- 在IIS将该目录做成应用程序：打开IIS —> 默认Web站点 —> 找到该目录右键打开属性页 —> 目录（或虚拟目录）卡 —> 在下半部分“应用程序设置”处点第一项的“创建”，把该目录做成应用程序。
在IIS中把站点主目录指向Web.config文件 --------------------编程问答-------------------- 两大强人，又学到东西了

补充：.NET技术 ,  ASP.NET