The mobile application "cannot load the previous operation due to low memory" after downloading the image?

I have a simple mobile application . It starts by asking the user to select an image, which is then downloaded locally using the following code and displayed on the canvas:

function handleFileSelect(evt) {
var files = evt.target.files;
var f = files[0];
console.log(evt);
var ctx = document.getElementById("myCanvas").getContext('2d'),
img = new Image(),
f = document.getElementById("uploadbutton").files[0],
url = window.URL || window.webkitURL,
src = url.createObjectURL(f);

img.src = src;
lastImage = img;
img.onload = function() 
{
    window.requestAnimationFrame(function(){
    var w = window.innerWidth;
    var h = window.innerHeight;
    ctx.clearRect(0, 0, w, h);
    ctx.drawImage(lastImage, 0, 0);
    //url.revokeObjectURL(src);
    });
}}

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