Error in Web Config in ASP.NET

ASP.NET WebForms and i am making authentication for users , but i get this error in web.config file:

Server Error in '/' Application.

Configuration Error

Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: sections are allowed only within sections.

Source Error:

Line 38: Line 39: Line 40: Line 41: Line 42:

Source File: C:\Users\dunja\Desktop\webapp1\web.config
Line: 40

Here is content of Web.Config file:

<?xml version="1.0"?>

<configuration>
  <configSections>
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>
    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
      <section name="webapp1.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </sectionGroup>
  </configSections>
  <connectionStrings>
    <add name="constr" providerName="System.Data.SqlClient" connectionString="Data Source=localhost;Initial Catalog=Gy;Integrated Security=SSPI;"/>
  </connectionStrings>
  <!--
    For a description of web.config changes for .NET 4.5 see http://go.microsoft.com/fwlink/?LinkId=235367.

    The following attributes can be set on the <httpRuntime> tag.
      <system.Web>
        <httpRuntime targetFramework="4.5" />
      </system.Web>
  -->
  <system.web>
    <compilation debug="true" targetFramework="4.5"/>
    <httpRuntime/>
    <pages controlRenderingCompatibilityVersion="4.0">
      <namespaces>
        <add namespace="System.Web.Optimization"/>
      </namespaces>
      <controls>
        <add assembly="Microsoft.AspNet.Web.Optimization.WebForms" namespace="Microsoft.AspNet.Web.Optimization.WebForms" tagPrefix="webopt"/>
      </controls>
    </pages>
    <authentication mode="Forms">
      <forms defaultUrl="~/User/User.aspx" loginUrl="~/Login.aspx" slidingExpiration="true" timeout="2880"></forms>
    </authentication>

   <location path="Admin">

      <authorization>
        <allow roles="admin"/>
        <deny users="*"/>
      </authorization>

  </location>
  </system.web>
</configuration>

Thanks to all !!