I was trying to the ball tutorial then i tried to selct and drag the ball to the screen to code but it was not working please look into this problem. it is very problematic
Maybe you didn't add a canvas. In order to add a ball a canvas much be inserted first. Then you drag and drop the ball in the canvas
Where did you find this tutorial? What code did you use?
Are you using this Block?
If you are not using it in your code, you probably need it or follow Ria's advice.