Problem removing a MovieClip instance

programming flash
1

[FONT=Times New Roman][SIZE=4]I am using the following code in insert and subsequently remove an empty movieclip. The movieClip is inserted correctly but is not being removed by the code. Can somebody please point out what I am doing wrong…….[/SIZE][/FONT]
[SIZE=4][FONT=Times New Roman] [/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman]on (Release) {[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] var pj = new PrintJob();[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] var success = pj.start();[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] if(success)[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] {[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] //this._xscale = 85;[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] //this._yscale = 85;[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] rectangle =_root.createEmptyMovieClip(“coverupper”,-9999);[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] rectangle.lineStyle(1,0xFFFFFF,100);[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] rectangle.moveTo(0,0);[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] rectangle.beginFill(0xFFFFFF,100);[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] rectangle.lineTo(Stage.width,0);[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] rectangle.lineTo(Stage.width,50);[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] rectangle.lineTo(0,50);[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] rectangle.endFill();[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] prt_frame_2._visible = false;[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] backButton1._visible = false;[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] pj.addPage(0,{xMin:200, xMax:1000, yMin:0,yMax:490},{printAsBitmap:false}, 2);[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] pj.send();[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] }[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] prt_frame_2._visible = true;[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] backButton1._visible = true;[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] coverupper.removeMovieClip();[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] delete pj;[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] //this._xscale = 100;[/FONT][/SIZE]
[SIZE=4][FONT=Times New Roman] //this._yscale = 100;[/FONT][/SIZE]
[FONT=Times New Roman][SIZE=4]}[/SIZE][/FONT]