Ionic app crashes after $cordovaFile is called

I'm trying to locally store images and video's on a Android app, by using $cordovaFile and $cordovaFileTransfer. For the images this works fine. I save them trough FileTransfer and load them from my device with File. Now I'm trying to do the same with a video, when I save the video the log gives me this message:

success message:
{
    "isFile":true,
    "isDirectory":false,
    "name":"movie1.mp4",
    "fullPath":"/movie1.mp4",
    "filesystem":"<FileSystem: files>",
    "nativeURL":"file:///data/data/com.ionicframework.tzw1sttry127880/files/movie1.mp4"
}

but when i'm trying to load it, the app stops, closes and doesn't log an error. Can someone tell me what i'm doing wrong? This is my code:

app.controller('reloadCtrl', function($scope, $timeout, $ionicPlatform, $cordovaFileTransfer, $cordovaFile, $ionicLoading, $log, $http ){

$ionicPlatform.ready(function() {
    var targetPath = null;

    window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem){
        persistentFilePath = cordova.file.dataDirectory;
    }, function(){
        alert("alert!!");
    });

    $scope.saveVideoOnDevice = function(){
        var testUrl = "http://videos.contentful.com/**token**/**token**/bobDylan.mp4"
        var targetPath2 = persistentFilePath + "movie1.mp4";
        var trustHosts2 = true;
        var options = {};
        $ionicLoading.show({
            template: "loading..."
        });

        $cordovaFileTransfer.download(testUrl, targetPath2, options, trustHosts2)
            .then(
            function(result2) {
                $ionicLoading.hide();
                $log.info('success message: '+ JSON.stringify(result2));
            },  function(err) {
                    $ionicLoading.hide();
                    alert('fail!!!!!');
                    $log.error('Error message: '+ JSON.stringify(err));
                },  function (progress) {
                        $timeout(function () {
                            $scope.downloadProgress = (progress.loaded / progress.total) * 100;
                        }) 
                    });
    };

    $scope.callVideo = function(){
        $cordovaFile.readAsDataURL(cordova.file.dataDirectory, "movie1.mp4")
            .then(
                function(result){
                $scope.lVideo = result;
            }, function(error) {
                $log.error(error);
            });
    };

});
});

Thanks !