The web server is configured to not list the contents of this directory

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ASP.NET

Visual-Studio

I have uploaded my site to smartasp.net hosting and when I try to access my site by URL I receive this message :

HTTP Error 403.14 - Forbidden
The Web server is configured to not list the contents of this directory.

my web.config is :

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<system.webServer >
<defaultDocument>
  <files>
    <add value ="addbook.aspx"/>
  </files>
</defaultDocument>
<directoryBrowse enabled ="true"/>
</system.webServer>
<configuration>
<system.web>
  <customErrors mode="Off"/>
</system.web>
</configuration>
<connectionStrings>
<add name="ConnectionString" connectionString="Data 
Source=SQL7002.site4now.net;Initial Catalog=DB_A3BC09_MonzerKarary;User 
Id=DB_A3BC09_?????????_admin;Password=@???????????;"
providerName="System.Data.SqlClient" />
</connectionStrings>
<system.web>
    <compilation debug="true" targetFramework="4.0"/>
</system.web>
</configuration>

how do I fix this ?!!

What I have tried:

<configuration>
  <system.webServer >
    <defaultDocument>
      <files>
        <add value ="addbook.aspx"/>
      </files>
    </defaultDocument>
    <directoryBrowse enabled ="true"/>
  </system.webServer>
  <configuration>