Problem using HDI membership provider with asp.net

I am trying to use HDI custom membership provider and after seting up with web.config when I run the applcation it gives me an error as shown below.

And I am unable to know where I am going wrong?Can anyone point me the right way?

Failed to map the path '/'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: Failed to map the path '/'.

This is my web.config:

<configuration>
  <connectionStrings>
    <add name="HDIConnectionString" providerName="System.Data.SqlClient" connectionString="Data Source=.\sqlexpress;Initial Catalog=HDIMembershipProvider;Integrated Security=True"/>
  </connectionStrings>
  <system.web>
    <membership defaultProvider="HDIMembershipProvider" userIsOnlineTimeWindow="15">
      <providers>
        <clear/>
        <add name="HDIMembershipProvider" type="HDI.AspNet.Membership.HDIMembershipProvider" connectionStringName="HDIConnectionString" enablePasswordRetrieval="true" enablePasswordReset="true" requiresQuestionAndAnswer="true" writeExceptionsToEventLog="false"/>
      </providers>
    </membership>
    <machineKey validationKey="34A0AF973A6817E4F7067DA1486E93AD5F7466B65D32405DB50766FDF335304F499C7B1943C084C7A67B1375D196CF02C8E84F297F7A0CA130C1D5722586749F" decryptionKey="48C8B6F952BC7C39DD91A2A17F17B08E113967DC5FF687FE6DFAF65F3248309C" validation="SHA1" decryption="AES"/>
    <authentication mode="Forms"/>
    <compilation debug="true" strict="false" explicit="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="S开发者_运维百科ystem.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"/>
      </assemblies>
    </compilation>
  </system.web>
   <system.net>
  </system.net>
</configuration>

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I have rectified the problem just by starting Visual Studio as Administrator.