Android Facebook SDK Can't Add Project

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http://stackoverflow.com – I have been following the tutorial found below and am having issues adding the Facebook SDK. https://developers.facebook.com/docs/getting-started/facebook-sdk-for-an... It occurs when I get to the stage of "Link to the SDK project and configure the Facebook app ID". When I go to Properties -> Android -> Add and add the FacebookSDK, it seems to work fine. However when I save and close that page, and go back into it, there is a big X against the reference. I have tried going into project properties and changing it from a relative url to a full url as such: FROM android.library.refe (HowTos)