ActionScript 3.0 :: Error 1046: Type Was Not Found Or Was Not A Compile-time Constant: Tractor_mc

I created a new document with two layers labeled, content and actions.I then create a movieclip named tractor_mc. I create two layers in tractor_mc, one called images, the other called actions.In frame one of tractor_mc, actions layer, I enter:
 
stop();
trace("tractor_mc has stopped");
 
I test the movie and it stops on the first frame and returns, "tractor_mc has stopped". All works well!I then choose scene 1.The layer named tractor_mc, has only 1 frame which contains the movieclip tractor_mc, which has the instance name of tractor_mc.I go to frame one of actions and enter:
 
trace("this is scene1, frame1");
 
Test movie and get the expected output of:this is scene1, frame1tractor_mc has stopped Now this is where my problem arrises: In Scene 1, action layer frame one, I add the code:
 
trace("this is scene1, frame1");
tractor_mc.gotoAndStop(3);
 
This returns the error:1046: Type was not found or was not a compile-time constant: tractor_mc.If I remove the tractor_mc.gotoAndStop(3); I still get the error message and the movie clip runs continously.