Server Error in '/' Application. ？？？

我用ASP.NET+SQL2005做的网站的IIS上浏览，出现了以下错误提示，为什么？

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 59: 以标识传入的用户。
Line 60: -->
Line 61: <authentication mode="Windows"/>
Line 62: <!--
Line 63: 如果在执行请求的过程中出现未处理的错误，

Source File: c:\inetpub\wwwroot\history\web.config Line: 61

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Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42

你只要在web.config 中加入 <pages enableEventValidation="true"/>
或者在page中假如<%@ Page EnableEventValidation="true" %> 也可以.主要是.net 安全机制问题.只要你提交内容有脚本代码.默认都会包错.

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