Build Provider Error in web config

<configuration>
  <connectionstrings>
    <remove name="LocalSqlServer" />
    <add name="LocalSqlServer" connectionstring="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;">
      providerName="System.Data.SqlClient" />
    <add name="legalprojectConnectionString" connectionstring="Data Source=SW-VERTEX54\SQLEXPRESS;Initial Catalog=legalproject;User ID=sa;Password=123">
      providerName="System.Data.SqlClient" />
    
  </add></add></add></connectionstrings>
  <system.web>
<httphandlers>
      <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" validate="false" />
    </httphandlers>
    <compilation debug="true" targetframework="4.0">    
<buildproviders>
        <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
      </buildproviders>  
      <assemblies>
        <add assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
        <add assembly="Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
        <add assembly="Microsoft.Build.Framework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
        <add assembly="System.Management, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
      </assemblies>
    </compilation>
    <customerrors mode="Off" />
    <httpruntime requestvalidationmode="2.0" />
    <pages controlrenderingcompatibilityversion="3.5" clientidmode="AutoID" />
 </system.web>
  <system.webserver>   
    <modules runallmanagedmodulesforallrequests="true" />
    <validation validateintegratedmodeconfiguration="false" />
        <defaultdocument>
            <files>
                <remove value="Index.php" />
                <remove value="Default.aspx" />
                <remove value="Default.asp" />
                <remove value="Default.htm" />
                <remove value="Index.aspx" />
                <remove value="Index.asp" />
                <remove value="Index.php3" />
                <remove value="Index.stm" />
                <remove value="Index.shtm" />
                <remove value="Index.shtml" />
                <remove value="Index.cfm" />
                <remove value="Index.htm" />
                <remove value="Index.html" />
                <add value="index.php" />
            </files>
        </defaultdocument>
  </system.webserver>
  <system.net>
   
  </system.net>
</configuration>