我在安装的时候提示如下：
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 41: 以标识传入的用户。
Line 42: -->
Line 43: <authentication mode="Windows" />
Line 44: <!--
Line 45: 如果在执行请求的过程中出现未处理的错误，
Source File: d:\freehost\xingyun13\web\cms4\web.config Line: 43
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Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433
是什么问题呢，根本不能看到安装配置页