Hi Guys, recently I included draw + sprite in my project and I got this error.

I have read some threads, but I didn't find any solution.

Could you help me?

Code:
Ext.create({    xtype: 'draw',
    plugins: 'spriteevents',
    renderTo: document.body,
    width: 200,
    height: 200,
    listeners: {
        spritemousedown: function (item, event) {
            var me = this,
                sprite = item.sprite,
                doc = Ext.getDoc(),
                moveListener;
            sprite.origPosition = {
                x: sprite.cx,
                y: sprite.cy,
                offsetX: sprite.attr.cx - event.xy[0],
                offsetY: sprite.attr.cy - event.xy[1]
            };
            moveListener = doc.on({
                mousemove: function (e) {
                    var cx, cy,
                        wall = me.width - 50;
                    cx = (e.xy[0] > wall) ? wall : e.xy[0] + sprite.origPosition.offsetX;
                    cy = (e.xy[1] > wall) ? wall : e.xy[1] + sprite.origPosition.offsetY;
                    if (cx <= 50) { cx = 50; }
                    if (cy <= 50) { cy = 50; }
                    sprite.setAttributes({
                        cx: cx,
                        cy: cy
                    });
                    sprite.getSurface().renderFrame();
                },
                scope: me,
                destroyable: true
            });


            doc.on({
                mouseup: function () {
                    moveListener.destroy();
                }
            });
        }
    },


    sprites: [
        {
            type: 'circle',
            cx: 50,
            cy: 50,
            r: 50,
            fillStyle: '#1F6D91'
        },
    ]
});