lua – 尝试在日冕中调用方法’translet'(零值)

function fallingCoins()
local myPlayer = display.newCircle( math.random(20,_W+20),-25,math.random(10,10)  )
    myPlayer:setStrokeColor(255,128,0 ) 
    myPlayer:setFillColor(math.random(245,255),math.random(210,223),7)
    myPlayer.myName = "myPlayer"
    physics.addBody( myPlayer,"static" )
    myPlayer.y = "150"
     local function muovi()
     myPlayer:translate(-2,0)
     end
 Runtime:addEventListener( "enterFrame",muovi );

end
timer.performWithDelay( 3000,fallingCoins )

如果碰到锚,我就会隐藏硬币.

function onCollision3( event )
   if(event.object1.myName == "guy" and event.object2.myName == "myPlayer") then
      event.object2:removeSelf(); 
   end
end
Runtime:addEventListener( "collision",onCollision3 )

如果我触摸硬币然后我就会收到此错误

"---------------------------
Corona Runtime Error
---------------------------
...asdesktoprun2scrollscrolling backgroundmain.lua:123: attempt to call method 'translate' (a nil value)
stack traceback:
    [C]: in function 'translate'
    ...asdesktoprun2scrollscrolling backgroundmain.lua:123: in function <...asdesktoprun2scrollscrolling backgroundmain.lua:122>
    ?: in function <?:218>

Do you want to relaunch the project?
---------------------------
Yes   No   
---------------------------
"

请帮我,我在做错了..