Не удается загрузить картинку

Вот так я загружаю картинки:

function loadSourcesImage(sources) {
    function getBase64Image(img) {
        var canvas = document.createElement("canvas"); // remove?
        canvas.width = img.width;
        canvas.height = img.height;
        var ctx = canvas.getContext("2d");
        ctx.drawImage(img, 0, 0);
        return canvas.toDataURL();
    }
    return $q(function(resolve, reject) {
        var promises = [];
        angular.forEach(sources, function(source) {
            promises.push($q(function(resolve, reject) {
                var imageObj = new Image();
                imageObj.crossOrigin = "anonymous";
                imageObj.onload = function() {
                    source.photo = getBase64Image(imageObj);
                    resolve(); 
                };
                imageObj.src = source.photo;
            }));
        });
        $q.all(promises).then(function() {
            resolve();
        });
    });
}

Но периодически, не для всех картинок, вываливается такая ошибка:

Access to Image at 'https://pp.vk.me/c837437/v837437845/740e/jErhvWmSCW8.jpg' from origin 'https://pp.vk.me' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8000' is therefore not allowed access.

Как можно избавиться от нее?