Error 1119: Access of possibly undefined property

I am trying to tween an object in a parent MC

ActionScript Code:
[LEFT]Tweener.[COLOR=#000080]addTween[/COLOR][COLOR=#000000]([/COLOR]parent.[COLOR=#000080]newsHolder[/COLOR], [COLOR=#000000]{[/COLOR]x:-[COLOR=#000080]675[/COLOR], [COLOR=#0000FF]time[/COLOR]:parent.[COLOR=#000080]slideTime[/COLOR], transition:parent.[COLOR=#000080]slideTransition[/COLOR][COLOR=#000000]}[/COLOR][COLOR=#000000])[/COLOR];

[/LEFT]

Error : 1119: Access of possibly undefined property newsHolder through a reference with static type flash.display:DisplayObjectContainer.

Am I using the “parent.” incorrectly?

newsHolder is a sprite - how should I access it?

This works well when executed at the same level as newsHolder:

ActionScript Code:
[LEFT]Tweener.[COLOR=#000080]addTween[/COLOR][COLOR=#000000]([/COLOR][COLOR=#000080]newsHolder[/COLOR], [COLOR=#000000]{[/COLOR]x:-[COLOR=#000080]675[/COLOR], [COLOR=#0000FF]time[/COLOR]:slideTime, transition:[COLOR=#000080]slideTransition[/COLOR][COLOR=#000000]}[/COLOR][COLOR=#000000])[/COLOR];

Tweener.[COLOR=#000080]addTween[/COLOR][COLOR=#000000]([/COLOR][COLOR=#000080]infoTabHolder[/COLOR], [COLOR=#000000]{[/COLOR]x:-[COLOR=#000080]675[/COLOR], [COLOR=#0000FF]time[/COLOR]:slideTime, transition:[COLOR=#000080]slideTransition[/COLOR][COLOR=#000000]}[/COLOR][COLOR=#000000])[/COLOR];
[/LEFT]

Thanks
Ian