Cycling through Post Effects on Tap

Hi 

I use lens studio v 2.3.1

I'am try to use this script but ist not working to change the effect by tap

// -----JS CODE-----
// @input SceneObject[] obj

var count = 0;
script.obj[0].enabled = true;

for (var i = 1; i < script.obj.length; i++)
{
script.obj[i].enabled = false;
}

function onTapped(eventData)
{
count++

for (var i = 0; i < script.obj.length; i++)
{
if (count == i)
{
script.obj[i].enabled = true;
}
else
{
script.obj[i].enabled = false;
}
}

if (count == script.obj.length)
{
count = 0;
script.obj[0].enabled = true;
}
}

var event = script.createEvent("TapEvent");
event.bind(onTapped);