hx
        initPhysics();
    }
    function initPhysics() {
        app.arcade.onUpdate(this, updatePhysics);
    }
    function updatePhysics(d: Float) {
        trace(plr);
        trace(block);
        plr.updatePhysics([block]); //!get collisions working
    }

onUpdate

TypeError: Cannot read property 'enable' of null

hx
//player
    public function updatePhysics(a:Array<arcade.Collidable>) {
        for (v in a) {
            app.arcade.world.collide(this, v);
        }

hx
//scene
    override function create() {
        app.arcade.world.gravityY = -90;

        block = initBlock("Hellope, worl!");
        add(block);
        
        plr = new Player();
        plr.depth = 1;
        plr.anchor(0.5, 0.5);
        plr.pos(width/2, height - 65);
        add(plr);

        var hint = initHint("I hate", "mice");
        add(hint);

        app.arcade.onUpdate(this, updatePhysics);
    }
    function updatePhysics(d: Float) {
        plr.updatePhysics([block]);
    }

block

hx
    function initBlock(t:String): Visual {
                //begin block and children definition//
        block = new Visual();
        block.depth = 0; //lets player be shown in front
        block.pos(width/2, height/2);

        var q = new Quad();
        q.size(200, 200);
        q.color = Color.WHITE;
        q.anchor(0.5, 0.5);
        q.initArcadePhysics();
        q.body.immovable = true;
        q.body.allowGravity = false;
        block.add(q);

        var txt = new Text();
        txt.align = CENTER;
        txt.color = Color.BLACK;
        txt.content = t;
        txt.anchor(0.5, 0.5);
        txt.pointSize = 30;
        txt.color = Color.CRIMSON;
        txt.clip = q; //makes text clip if out of q bounds
        block.add(txt);

plr.updatePhysics([block.children[0]]);

arcade.onUpdate

block

q