Flash CS5.5 Compiler Errors

Question

Just upgraded from CS5 to CS5.5
Code that worked in CS5 now gives compiler errors:
Symbol 'VideoPlayerMC', Layer 'Layer 2', Frame 1, Line 21     1119: Access  of possibly undefined property state through a reference with static  type flash.events:VideoEvent.
Symbol 'VideoPlayerMC', Layer 'Layer 2', Frame 1, Line 42     1119: Access  of possibly undefined property PLAYHEAD_UPDATE through a reference with  static type Class.
etc....
Problem only seems to happen if I publish to Flash Player 10.2
or to Air for IOS

Answer 1

one could also use following ( works in FP 11.2 and probably in air2.5+ ):
flvPlayback.addEventListener( fl.video.VideoEvent.PLAYHEAD_UPDATE, videoEventHandler, false, 0, true);
function videoEventHandler( v:fl.video.VideoEvent ):void
    switch ( v.type )
        case fl.video.VideoEvent.PLAYHEAD_UPDATE:
            trace ( v.playheadTime );
            break;
Its probably conflicting with flash.events.VideoEvent.
Code formating