Error if using inside FirebaseMessagingService

[patelakshay13890]

I want to load Image from URL into Notification Style as BigPictureStyle.
I am getting error while using

java.lang.IllegalStateException: Method call should happen from the main thread.

And Code I'm using is

Picasso.get().load(imageUri)
.into(new Target() {
@OverRide
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
notifyBitmap = bitmap;
}

                        @Override
                        public void onBitmapFailed(Exception e, Drawable errorDrawable) {
                        }

                        @Override
                        public void onPrepareLoad(Drawable placeHolderDrawable) {
                        }
                    });