500 - Internal server error. There is a problem with the resource you are looking for, and it cannot be displayed.

<configuration>
   <connectionstrings>
    <add name="Enlightenment" connectionstring="Data Source=ABHI;Initial Catalog=mytour;Integrated Security=True" providername="System.Data.SqlClient" />
   
  </connectionstrings>
  <system.web>
    <compilation debug="true" targetframework="4.0">
      <assemblies>
        <add assembly="System.Data.Services.Client, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
      </assemblies>
    </compilation>
    <httpruntime targetframework="4.0" />
    <authentication mode="Windows" />
    <customerrors mode="Off" />
    <trust level="Full" />
    <pages>
      <controls>
        <add tagprefix="asp" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
      </controls>
    </pages>
  </system.web>
  <appsettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
  </appsettings>
  <system.webserver>
    <httperrors errormode="Detailed" />
        <asp scripterrorsenttobrowser="true" />
    <directorybrowse enabled="true" />
  </system.webserver>
</configuration>