Configuration Error

Question

how to solve this error:

 

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...

 

 

 

use this code:

 

<?xml version="1.0"?>

<configuration>

<system.web>

<compilation debug="true" targetFramework="4.0" />

<customErrors mode="Off"/>

</system.web>

<system.webServer>

<directoryBrowse enabled="false" />

<defaultDocument>

<files>

<clear />

<add value="Default.htm" />

<add value="default.html" />

<add value="Default.asp" />

<add value="index.htm" />

<add value="index.html" />

<add value="index.asp" />

<add value="Default.aspx" />

<add value="index.aspx" />

<add value="default.php" />

<add value="index.php" />

</files>

</defaultDocument>

</system.webServer>

</configuration>