Looks like you put it on a movieclip instead of on a frame. You can’t use[AS]
stop();
[/AS]
just like that on a movieclip. It has to be placed within an on/onClipEvent handler (eg on(press) / onClipEvent(load) ). You said the movie still stopped. Are you sure you haven’t put the stop() action on both the frame and the mc ? That would be a possible cause of the error but the movieclip still stopping.
When you added the stop(); it looks like you’ve added to the MC and not in the MC itself.
You must of had the MC selected and then opened the actions panel and put the stop(); action in there. Instead, double click the MC so you can see the timeline for the MC, and add the stop(); action in there.