Airplay Does not Work

hi,
don't know if or can't airplay work. done have required. starting updating apple tv ios 5.1 beta 2, getting mountain lion developer preview , installing in macbook pro. have both apple tv , macbook pro on same wireless network. have registered udid in xcode provisioning profiles. going on? don't see airplay option in display preferences. working appreciated, in advance reply.

macbook pro specs
intel core i7 second gen sandy bridge 2.6 ghz
8 gb ddr3
os x 10.8

 

http://9to5mac.com/2012/02/17/os-x-...rroring-apparently-not-supported-on-all-macs/

 

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