Action Script Buttons

So I'm trying to script a next button to go from a frame which I stopped using "stop();" to play another movie clip before it goes onto the next stage (which worked fine) however I used the code snippet "Click to go to frame and play" and put "691" which is the next frame I want it to go to when I click the Next Button but for some reason nothing happens when i preview and click it. All the previous times in this same project where I've created a next button it worked but not sure why for this part it isn't working.

Can someone help? I can send you the file if you need but I just need this to work.

Here is the code I put in frame 690 which is where I stopped it.

stop();

// Play a Movie Clip
mccroppedearth.play();

// Click to Go to Frame and Play

next_btn.addEventListener(MouseEvent.CLICK, fl_ClickToGoToAndPlayFromFrame_3);

function fl_ClickToGoToAndPlayFromFrame_3(event:MouseEvent):void
{
gotoAndPlay(691);
}