Can't load serverSocket class Networking two Air Applications

I'm trying to make a Air server send files that server located on another computer on a local network and have then saved. All docs I have found require the serverSocket class.

I'm using FlashBuilder4(Air is selected as project) and when I go to import: "import flash.net.ServerSocket;" Socket is th开发者_JAVA技巧ere but ServerSocket is not, am I missing something?

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SOLVED I was running Flashbuilder 4 with Air SDK 1.x.x Air SDK need to be updated to AirSDK2.0

Instructions to update are here: http://www.adobe.com/support/documentation/en/air/2/releasenotes_developers.html#h