Movie Clip Communication

I have a situation with movie clip communication. On the main timeline, I have a movie clip with an instance name of newsBG. Nested inside newsBG is another movie clip, which starts on frame 15 called newsDD. This nested clip plays to frame 15 too and then there is a button with a function that plays a closing animation. On the final frame, I’m trying to write a script that tells newsBG to start playing from frame 16 again. Here’s what I’ve tried so far:

this.newsBg.gotoAndPlay(16);

this.newsBg.gotoAndPlay(16);

This throws the following error:

1061: Call to a possibly undefined method gotoAndPlay through a reference with static type flash.display:DisplayObjectContainer.