Error When installing NuGet package 'Microsoft.AspNet.Http.Extensions 1.0.0 beta3'

When installing 'Microsoft.AspNet.Http.Extensions 1.0.0-beta3' I get this. I am trying to use it for iappbuilder reference so I can create an app with my app. Any ideas what could cause this?

Install failed. Rolling back...
Install-Package : Could not install package 'Microsoft.AspNet.Http.Extensions 1.0.0-beta3'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.5', but the package does not contain any 
assembly references or content files that are compatible with that framework. For more information, contact the package author.
At line:1 char:1
+ Install-Package Microsoft.AspNet.Http.Extensions -Pre
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], InvalidOperationException
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand
Jon Skeet
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That package only has aspnet50 and aspnetcore50 directories within the lib directory. This means it's only suitable for ASP.NET vNext projects. You can't use it within a regular .NET 4.5 project - yet, at least.

If you're not using ASP.NET vNext, you should probably ignore it completely.

If you are using ASP.NET vNext, you should check your project.json configuration file, and ensure that your configured runtimes are aspnet50 and/or aspnetcore50.

Note that these runtime names are changing as a part of the grand k -> dnx rename.

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