Please help me with Xamarin in VS2013

Hi, somebody please lift me up from my misery with VS2013 and Xamarin - every time I try to run an app, I get this message "Please select a valid device.". When I click "open SDK manager" - nothing happens. When I click "open VDM" - nothing happens. I have all Xamarin prerequisites installed as the offical manual says. My project is a startup project. I tried reinstalling Xamarin, Java SDK and Android SDK like four times now.


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