¿How to add spriteSheet animation to a sprite added from Cromposer?

I have added in Composer the sprite tagged “bat” and inserted it inside the group “gameGroup” and works fine but I need to add a sprite sheet animation and doesn’t work for me. I think the reason is that I’m calling “bat = display.newSprite…” and this is creating a new sprite of course, so how can assign a sprite sheet and not create a new one?

Thanks!

gameGroup = self:getObjectByTag( "gameGroup" ) local bat = self:getObjectByTag( "bat" )     bird2SpriteSheet = graphics.newImageSheet( "birdRedAnimationSmall.png", { width=110, height=153, numFrames=16 } )     bat = display.newSprite( bird2SpriteSheet, { name="bat", start=1, count=5, time=400 } )     bat.x, bat.y = screenW\*0.5, 130     bat.xScale = 1.25     bat.yScale = 1.25     bat.anchorX = 0.5     bat.anchorY = 0.5     bat.alpha = .97     bat:play()