Could not install package 'Microsoft.Owin.Security 2.0.2'

i am trying to install SignalR on my Website ( Not a Web application ) (using visual studio 2012 ), when i created my website ( File--New Website ) i selected .net 4.5, my problem is when i am installing SignalR with Nuget Package this error happens

Install failed. Rolling back... Could not install package 'Microsoft.Owin.Security 2.0.2'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.0', but the package does not contain any assembly references that are compatible with that framework. For more information, contact the package author.

on also in my web.config line <httpRuntime targetFramework="4.5"/> says

the targetFramework attribute is not allowed.

and my web.config is

    <?xml version="1.0"?>
  For more information on how to configure your ASP.NET application, please visit
    <add name="KutSocialNetworkConnectionString" connectionString="Data Source=.;Initial Catalog=KutSocialNetwork;Integrated Security=True" providerName="System.Data.SqlClient"/>
    <compilation debug="true" targetFramework="4.5"/>
    <httpRuntime targetFramework="4.5"/>
    <add key="path" value=""/>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>

    <modules runAllManagedModulesForAllRequests="true">
      <remove name="UrlRoutingModule"/>
      <add name="UrlRoutingModule"
           type="System.Web.Routing.UrlRoutingModule, System.Web, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
      <add name="UrlRoutingHandler"
           type="System.Web.HttpForbiddenHandler, System.Web, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>



So it was Easy , i downloaded directly from Nuget , and also delete my webconfig and created a new One

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