Reprogram navigation from procedural to OOP

First error is in the BtnRmc 1061: call to a possibly undefined method gotoAndPlay througt a reference with static tipe… …:Stage

package  {
    import flash.display.MovieClip;
    import flash.events.Event;
    
    public class Main extends MovieClip {
        
        private var BtnL:BtnLmc;
        private var BtnR:BtnRmc;

        public function Main() {
            stop();
            //adding the Btns class
            var btns:Btns = new Btns();
            addChild(btns);
            
            this.addEventListener(Event.ADDED_TO_STAGE, toStage, false, 0, true);
        }
        private function toStage(event:Event):void {
            this.removeEventListener(Event.ADDED_TO_STAGE, toStage);
            stage.addEventListener(Event.ENTER_FRAME, onEnter, false, 0, true);
        }
        //add actions at specific frame 
        private function onEnter(event:Event):void {
            var frame:Number;
            frame = currentFrame;
            switch (frame) {
                case 1 :
                stop();
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 10 :
                gotoAndStop(11);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 20 :
                gotoAndStop(21);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 30 :
                gotoAndStop(31);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 40 :
                gotoAndStop(41);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 50 :
                gotoAndStop(51);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 60 :
                gotoAndStop(61);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 70 :
                gotoAndStop(71);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 80 :
                gotoAndStop(1);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 90 :
                gotoAndStop(71);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 100 :
                gotoAndStop(61);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 110 :
                gotoAndStop(51);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 120 :
                gotoAndStop(41);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 130 :
                gotoAndStop(31);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 140 :
                gotoAndStop(21);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 150 :
                gotoAndStop(11);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
                case 160 :
                gotoAndStop(1);
                BtnR.visible = true;
                BtnL.visible = true;
                break;
            }
        
        }

    }
    
}
package  {
    
    import flash.display.MovieClip;
    import flash.ui.Mouse;
    import flash.events.MouseEvent;
    import flash.events.Event;
    
    public class Btns extends MovieClip {
        //add instance to the display list
        public var BtnL:BtnLmc = new BtnLmc();
        public var BtnR:BtnRmc = new BtnRmc();
        //array of buttons example: parrent(BtnL).child(BtnL1)
        public var buttonsAr:Array = [BtnR.BtnR1, BtnR.BtnR2, BtnR.BtnR3, BtnR.BtnR4, BtnL.BtnL1, BtnL.BtnL2, BtnL.BtnL3, BtnL.BtnL4];

        public function Btns() {
            //add childs to the stage
            BtnL.x = 143,3;
            BtnL.y = 111,3;
            addChild(BtnL);
            
            BtnR.x = 641,2;
            BtnR.y = 111,3;
            addChild(BtnR);
            
            //BtnL and R name
            BtnL.name = "BtnL";
            BtnR.name = "BtnR";
            //call setButtons function
            setButtons();
        }
        public function setButtons():void {
            for (var i:int = 0; i < buttonsAr.length; i++) {
                buttonsAr*.buttonMode = true;
                buttonsAr*.mouseChildren = true;
                buttonsAr*.mouseEnabled = true;
                //listeners to array of buttons
                buttonsAr*.addEventListener(MouseEvent.ROLL_OVER, playOver, false, 0, true);
                buttonsAr*.addEventListener(MouseEvent.ROLL_OUT, playOut, false, 0, true);
                buttonsAr*.addEventListener(MouseEvent.CLICK, doClick, false, 0, true);
            }
        }
        public function playOver(event:MouseEvent):void {
            //button state "over"
            event.currentTarget.gotoAndStop("over");
        }
        
        public function playOut(event:MouseEvent):void {
            //button state "out"
            event.currentTarget.gotoAndPlay("out");
        }
        public function doClick(event:MouseEvent):void {
            //release(to "up" state), if any button is selected(in down state)
            function setSelectedBtn():void {
                for (var i:int=0; i< buttonsAr.length; i++) {
                    if (buttonsAr*.currentLabel == "down"){
                        buttonsAr*.gotoAndStop("up");
                        buttonsAr*.buttonMode = true;   
                        buttonsAr*.mouseEnabled = true;   
                        buttonsAr*.mouseChildren = true;
                    }
                }
            }
            switch (event.target.parent.name) {
                //parent container is BtnL, means any of nested MCs.
                case "BtnL" :
                    //each button cause his neigbour button selected("down state"), and block his functionality.
                    if (event.target.name == "BtnL2") {
                        BtnL.BtnL1.gotoAndStop("down");
                        BtnL.BtnL1.buttonMode = false;
                        BtnL.BtnL1.mouseEnabled = false;
                        BtnL.BtnL1.mouseChildren = false;
                    }
                    else if (event.target.name == "BtnL3") {
                        BtnL.BtnL2.gotoAndStop("down");
                        BtnL.BtnL2.buttonMode = false;
                        BtnL.BtnL2.mouseEnabled = false;
                        BtnL.BtnL2.mouseChildren = false;
                    }
                    else if (event.target.name == "BtnL4") {
                         BtnL.BtnL3.gotoAndStop("down");
                        BtnL.BtnL3.buttonMode = false;
                        BtnL.BtnL3.mouseEnabled = false;
                        BtnL.BtnL3.mouseChildren = false;
                    }
                    else {
                        BtnR.BtnR1.gotoAndStop("down");
                        BtnR.BtnR1.buttonMode = false;
                        BtnR.BtnR1.mouseEnabled = false;
                        BtnR.BtnR1.mouseChildren = false;
                    }
                    //making buttons unvisible to show the animation layer (buttons tween made at stage)
                    BtnR.visible = false;
                    BtnL.visible = false;
                    break;
                //same like first case, but for right buttons
                case "BtnR" :
                    if (event.target.name == "BtnR2") {
                        BtnR.BtnR1.gotoAndStop("down");
                        BtnR.BtnR1.buttonMode = false;
                        BtnR.BtnR1.mouseEnabled = false;
                        BtnR.BtnR1.mouseChildren = false;
                    }
                    else if (event.target.name == "BtnR3") {
                        BtnR.BtnR2.gotoAndStop("down");
                        BtnR.BtnR2.buttonMode = false;
                        BtnR.BtnR2.mouseEnabled = false;
                        BtnR.BtnR2.mouseChildren = false;
                    }
                    else if (event.target.name == "BtnR4") {
                        BtnR.BtnR3.gotoAndStop("down");
                        BtnR.BtnR3.buttonMode = false;
                        BtnR.BtnR3.mouseEnabled = false;
                        BtnR.BtnR3.mouseChildren = false;
                    }
                    else {
                        BtnL.BtnL1.gotoAndStop("down");
                        BtnL.BtnL1.buttonMode = false;
                        BtnL.BtnL1.mouseEnabled = false;
                        BtnL.BtnL1.mouseChildren = false;
                    }
                    BtnR.visible = false;
                    BtnL.visible = false;
                    break;
                
            }
            
        }

    }
    
}
package  {
    
    import flash.display.MovieClip;
    import flash.ui.Mouse;
    import flash.events.MouseEvent;
    import flash.events.Event;
    import flash.display.Stage;
    
    public class BtnRmc extends Btns {
        
        public function BtnRmc() {
            // constructor code
        }
        override public function doClick(event:MouseEvent):void {
            //when we do the click at the currentlabel, gotoAndPlay animation which is than stopet bi Main function onEnter
            switch (currentLabel) {
                case "first" :
                stage.gotoAndPlay(83);
                break;
                case "second" :
                stage.gotoAndPlay(153);
                break;
                case "third" :
                stage.gotoAndPlay(143);
                break;
                case "fourth" :
                stage.gotoAndPlay(133);
                break;
                case "fiveth" :
                stage.gotoAndPlay(123);
                break;
                case "sixth" :
                stage.gotoAndPlay(113);
                break;
                case "seventh" :
                stage.gotoAndPlay(103);
                break;
                case "eight" :
                stage.gotoAndPlay(93);
                break;
            }
        
        }

    }
    
}
package  {
    
    import flash.display.MovieClip;
    import flash.ui.Mouse;
    import flash.events.MouseEvent;
    import flash.events.Event;
    import flash.display.Stage;
    
    public class BtnLmc extends Btns {
        
        public function BtnLmc() {
            // constructor code
        }
        override public function doClick(event:MouseEvent):void {
            //similar to the BtnRmc, but the animation from left to right is betwen the keyframes, so it is enough jst to play().
            stage.play();
            switch (currentLabel) {
                case "first" :
                break;
                case "second" :
                break;
                case "third" :
                break;
                case "fourth" :
                break;
                case "fiveth" :
                break;
                case "sixth" :
                break;
                case "seventh" :
                break;
                case "eight" :
                break;
            }
        
        }

    }    

}