关于corona sdk 移动对象问题

下面的代码在场景中移动对象。但是引起内存泄露，并且没有响应。

//transition back
local function goBack( )
    transition.to ( wall2, { time = 10000, x = 100, y = 310, onComplete = startTransition})
    transition.to ( wall, { time = 10000, x = 700, y = 200, onComplete = startTransition})
    transition.to (gate_a, { time = 10000, x = 100, y = 255, onComplete = startTransition})
    transition.to ( stargate_a, { time = 10000, x = 100, y = 255, onComplete = startTransition})
end    
//transition start
function startTransition( )
    transition.to ( wall2, { time = 10000, x = 700, y = 310, onComplete = goBack})
    transition.to ( wall, { time = 10000, x = 100, y = 200, onComplete = goBack})
    transition.to ( gate_a, { time = 10000, x = 700, y = 255, onComplete = goBack})
    transition.to ( stargate_a, { time =10000, x = 700, y = 255, onComplete = goBack})
end    
startTransition()

怎么样解决内存泄露的问题？