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Missing namespaces

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Hi,
Created a web application (with a login page, export a file page and a user management page) and when I attempt to build the application, I get the following errors:

BC40057: Namespace or type specified in the project-level Imports 'Microsoft.AspNet.Identity' doesn't contain any public member or cannot be found.

40057: Namespace or type specified in the project-level Imports System.Web.Optimization' doesn't contain any public member or cannot be found.

So I open the property pages for the project, select the References section, click Add to open the Reference Manager and discover the assemblies I need are not there to be selected.

What do I do now?

Regards,
Red

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