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Partitions should be displayed only once in the configuration file. See the <location> Help topic for exceptions. Why?

Configuration Error Description: An error occurred while processing the configuration file needed to service this request. Review the specific error information below and modify your configuration file accordingly.

<configuration>

  <system.net>
    <mailSettings>
      <smtp from="makovetskiyd@yahoo.co.uk">
        <network host="smtp.gmail.com" enableSsl="true" defaultCredentials="false" port="587" userName="****" password="****"/>
      </smtp>
    </mailSettings>
  </system.net>

  <connectionStrings>
    <clear/>
<add name="SqlState" connectionString="Data Source=localhost;DataBase=AnyNameOfServerState;Integrated Security=True" providerName="System.Data.SqlClient"/>
<add name="YourGuruDB" connectionString="Data Source=DIMA-00AA1DA557;Initial Catalog=model;Integrated Security=True"/>
<add name="modelConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename='D:\Documents and Settings\Dima\My Documents\Visual Studio 2010\WebSites\WebSite10\App_Data\ASPNETDB.MDF';Integrated Security=True;User Instance=True;Trusted_Connection=Yes;" providerName="System.Data.SqlClient"/>
  </connectionStrings>


  <system.web>

<sessionState mode="SQLServer" sqlConnectionString="SqlState" allowCustomSqlDatabase="true" cookieless="false" timeout="20"/>
<compilation debug="true"/>

<authentication mode="Forms">
  <forms name=".MyCookie" loginUrl="~/Registration.aspx" protection="All" timeout="30" path="/">
    <credentials passwordFormat="MD5">
      <user name="****" password="****"/>
    </credentials>
  </forms>
</authentication>

<authorization>
  <deny users="?"/>
  <allow users="*"/>
</authorization>

<roleManager enabled="true" defaultProvider="MyRoleProvider">
  <providers>
    <clear/>
    <add name="MyRoleProvider" applicationName="/" connectionStringName="modelConnectionString" type="System.Web.Security.SqlRoleProvider"/>
  </providers>
</roleManager>

<membership defaultProvider="MyMembershipProvider">
  <providers>
    <clear/>
    <add name="MyMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="modelConnectionString" minRequiredPasswordLength="1" minRequiredNonalphanumericCharacters="0" enablePasswordReset="true" maxInvalidPasswordAttempts="1000" passwordAttemptWindow="4000" enablePasswordRetrieval="true" requiresUniqueEmail="false" passwordFormat="Encrypted" applicationName="/WebSite10"/>
  </providers>
</membership>

<machineKey validationKey="****" decryptionKey="****" validation="SHA1" decryption="AES"/>
<compilation debug="true" targetFramework="4.0">
  <assemblies>
    <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=****"/>
    <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=****"/>
    <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=****"/>
    <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=****"/>
  </assemblies>
</compilation>

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3 answers

You have two compilation tags

<compilation debug="true"/>

and

<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="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>   
    </assemblies> 
</compilation>
+4
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The error below is if there is a compilation element in the configuration file twice. Just take one or the other.

There seem to be two sections.

Delete <compilation>

Holidays <compilation debug="true" >

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I ran into this problem today after installing the Ajax toolkit. If you added custom controls before installing ajax toolkit via web.config as:

<pages>
    <controls> 
             <!--Your custom control class information-->      
             <add tagPrefix=".." namespace="..."/>      
    </controls>
 </pages>

merge it with ajaxToolkit section after removing your tags as:

<pages>   
      <controls>
        <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />    
        <!--Your custom control class information-->
        <add tagPrefix="..." namespace="..." />
      </controls>
</pages>
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