Deploying issue : IIS Error code 0x80070021

got problem while deploying website. The web application works perfectly while running from visual studio but while i trying to deploy it using IIS, it didn't work. IIS tells that there is problem in web.config.

HTTP Error 500.19 - Internal Server Error


The requested page cannot be accessed because the related configuration data for the page is invalid.
Module	IIS Web Core
Notification	BeginRequest
Handler	Not yet determined
Error Code	0x80070021
Config Error	This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".
Config File	\\?\D:\WebProd\WebProd\web.config

Web config syntax:

<?xml version="1.0" encoding="UTF-8"?><!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  --><configuration>
	<appSettings>
     <add key="CrystalImageCleaner-AutoStart" value="true" />
     <add key="CrystalImageCleaner-Sleep" value="60000" />
     <add key="CrystalImageCleaner-Age" value="120000" />
 </appSettings>
    <location path="127.0.0.1" allowOverride="true">
      <system.webServer>
        <security>
          <authentication>
            <!-- note: this is different than previous example, in that  -->
            <!-- the content of the section is in the original place and -->
            <!-- was not moved here; in addition, the section is also    -->
            <!-- specified here, just by its name, so that it gets       -->
            <!-- unlocked only for the site specified in the location.   -->
            <windowsAuthentication/>
          </authentication>
        </security>
      </system.webServer>
    </location>
 <connectionStrings>
		 <add name="MyDbConn" connectionString="Server=cn-server\cndev2008; Database=WebApp; Integrated Security=SSPI" providerName="System.Data.SqlClient" />
		 <!--<add name="MyDbConn" connectionString="Server=yoyonk-pc\yonksql; Database=WebApp; Integrated Security=SSPI" providerName="System.Data.SqlClient"/>-->
 </connectionStrings>
	<system.web>
		<compilation debug="true" targetFramework="4.0">
			<assemblies>
				<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"  />
				<add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
				<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
				<add assembly="CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304" />
				<add assembly="CrystalDecisions.Shared, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304" />
				<add assembly="log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304" />
				<add assembly="CrystalDecisions.ReportSource, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304" />
				<add assembly="CrystalDecisions.ReportAppServer.Controllers, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304" />
				<add assembly="CrystalDecisions.ReportAppServer.DataDefModel, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304" />
				<add assembly="CrystalDecisions.CrystalReports.Engine, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304" />
        <add assembly="CrystalDecisions.ReportAppServer.ClientDoc, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/></assemblies></compilation>
	<httpHandlers><add verb="GET" path="CrystalImageHandler.aspx" type="CrystalDecisions.Web.CrystalImageHandler, CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304" /></httpHandlers></system.web>
 
    <system.webServer><handlers>
        <add name="CrystalImageHandler.aspGET"  verb="GET" path="CrystalImageHandler.aspx" type="CrystalDecisions.Web.CrystalImageHandler, CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304" preCondition="integratedMode" />
 </handlers><validation validateIntegratedModeConfiguration="false" />
      
      <defaultDocument enabled="true">
            <files>
                <remove value="index.html" />
                <remove value="iisstart.htm" />
                <remove value="index.htm" />
                <remove value="Default.asp" />
                <remove value="Default.htm" />
                <add value="index.aspx" />
            </files>
        </defaultDocument></system.webServer></configuration>