[flexcoders] Error #1014: Class flash.filesystem::FileStream could not be found.

[jp andino]

I get the flowing error when i load my SWF, the AIR version works fine, 
i got a line to import flash.filesystem.*;

VerifyError: Error #1014: Class flash.filesystem::FileStream could not 
be found.

            at [verify]

            at global$init()

            at _Wizardv2WatcherSetupUtil$/init()

            at mx.managers::SystemManager/private::docFrameHandler()

            at [execute-queued]