NPE while setting image bitmap in recycler view

Question

I am trying to fetch image from my firebase storage of which location is stored in a field of firestore doc, convert it into a bitmap and then set it to recycler view imageview.

This is my onBindViewHolder method :

@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

    //This is an executor task for fetching image from firebase storage
    setImageTask = Executors.newFixedThreadPool(4);

    //contactToShow is a contact class object which has id, name and ph no. as fields
    contactToShow = Objects.requireNonNull(contactList.get(position));
    //setting name and ph no in recycler view
    holder.name.setText(contactToShow.getName());
    holder.phoneNumber.setText(contactToShow.getPhoneNumber());

    //This is for fetching image location from firebase document for corresponding contact
    db.collection("ContactData").document(String.valueOf(contactToShow.getId())).get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
        @Override
        public void onSuccess(DocumentSnapshot documentSnapshot) {
            //this fetches location and saves it in contactProfileImageLocation
            contactProfileImageLocation = documentSnapshot.getString("IMAGE LOCATION");
            Log.d("AppLogs", "ImageLocFromAdapter : " + contactProfileImageLocation);

            //executor class for fetching image from location got from above code
            setImageTask.execute(() -> {
                
                //imageRef is a storage reference and storage is a firebase storage instance
                //These are the following Global Variables :
                //    FirebaseFirestore db = FirebaseFirestore.getInstance();
                //   FirebaseStorage storage = FirebaseStorage.getInstance();
                //Contact contactToShow;
                //String contactProfileImageLocation;
                //ExecutorService setImageTask;
                
                //setting imageRef
                imageRef = storage.getReference(contactProfileImageLocation);
                try {
                    //creating a local file to store downloaded image
                    File localFile = File.createTempFile("tempFile",".jpg");
                    //downloading image
                    imageRef.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
                        @Override
                        public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
                            //creating bitmap out of image file on success
                            Bitmap bitmap = BitmapFactory.decodeFile(localFile.getAbsolutePath());
                            //setting bitmap to image view
                            holder.contactImageView.setImageBitmap(bitmap);
                        }
                    });

                } catch (IOException e) {
                    e.printStackTrace();
                }

            });
        };
    });
}

and I am getting this error :

2022-07-31 16:46:49.872 19977-19977/com.example.contactroom E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.contactroom, PID: 19977
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageBitmap(android.graphics.Bitmap)' on a null object reference
    at com.example.contactroom.adapter.RecyclerViewAdapter$1$1.onSuccess(RecyclerViewAdapter.java:106)
    at com.example.contactroom.adapter.RecyclerViewAdapter$1$1.onSuccess(RecyclerViewAdapter.java:102)
    at com.google.firebase.storage.StorageTask.lambda$new$0$com-google-firebase-storage-StorageTask(StorageTask.java:123)
    at com.google.firebase.storage.StorageTask$$ExternalSyntheticLambda12.raise(Unknown Source:6)
    at com.google.firebase.storage.TaskListenerImpl.lambda$onInternalStateChanged$2$com-google-firebase-storage-TaskListenerImpl(TaskListenerImpl.java:90)
    at com.google.firebase.storage.TaskListenerImpl$$ExternalSyntheticLambda2.run(Unknown Source:6)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7656)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

2022-07-31 16:46:49.893 19977-19977/com.example.contactroom I/Process: Sending signal. PID: 19977 SIG: 9

My Debug log is showing :

2022-07-31 16:19:58.028 19382-19382/com.example.contactroom D/AppLogs: ImageLocFromAdapter : images/1659264211278

this means image is getting saved on firebase and location for the corresponding contact is being fetched correctly and getting stored in contactProfileImageLocation

Then where i am going wrong ?

ViewHolder Class :

ContactRow.xml :