NativeScript JobScheduler JobService.class is undefined - undefined

Question

I have weird error while i'm trying to create component in the JobScheduler
At the first line when setting a component value i get this error:
ERROR TypeError: Cannot read property 'MyJobService' of undefined
Both of the files are in the same folder, and its all worked yesterday.
I cleaned up the platforms folder just to be sure, because i dragged some pics to the drawble folders in the app_Resources and i had to build the project again and maybe something has changed. but it did not helped.
What can cause this problem ? am i missing something ?
JobScheduler.js :
function scheduleJob(context) {
var component = new android.content.ComponentName(context, com.tns.notifications.MyJobService.class);
const builder = new android.app.job.JobInfo.Builder(1, component);
builder.setPeriodic(15 * 60 * 1000);
builder.setOverrideDeadline(0);
const jobScheduler = context.getSystemService(android.content.Context.JOB_SCHEDULER_SERVICE);
console.log("Job Scheduled: " + jobScheduler.schedule(builder.build()));
}
module.exports.scheduleJob = scheduleJob;
MyJobService.js :
android.app.job.JobService.extend("com.tns.notifications.MyJobService", {
onStartJob: function(params) {
console.log("Job execution ...");
var utils = require("utils/utils");
var context = utils.ad.getApplicationContext();
var builder = new android.app.Notification.Builder(context);
console.log("setting notification head and body")
builder.setContentTitle("notification triggered ")
.setAutoCancel(true)
.setColor(android.R.color.holo_purple)//getResources().getColor(R.color.colorAccent))
.setContentText("body)
.setVibrate([100, 200, 100])
.setSmallIcon(android.R.drawable.btn_star_big_on);
var mainIntent = new android.content.Intent(context, com.tns.NativeScriptActivity.class);
var mNotificationManager = context.getSystemService(android.content.Context.NOTIFICATION_SERVICE);
const channelId = "my_channel_01";
const name = "Channel name";
const description = "Channel description";
const importance = android.app.NotificationManager.IMPORTANCE_LOW;
if (android.os.Build.VERSION.SDK_INT >= 26) {
console.log("api level is good",android.os.Build.VERSION.SDK_INT)
}
const mChannel = new android.app.NotificationChannel(channelId, name,importance);
mChannel.setDescription(description);
mChannel.enableLights(true);
mChannel.enableVibration(true);
mNotificationManager.createNotificationChannel(mChannel);
builder.setChannelId(channelId);
mNotificationManager.notify(1, builder.build());
return false;
},
onStopJob: function() {
console.log("Stopping job ...");
}
});