Android app crashes upon removing an item from FirebaseRecyclerAdapter

I created a remove function in the populateViewHolder like so:

viewHolder.mView.setOnLongClickListener(new View.OnLongClickListener() {
    @Override
    public boolean onLongClick(View v) {
        new AlertDialog.Builder(getContext())
                .setTitle("Are you sure?")
                .setMessage("Do you want to delete this note?")
                .setPositiveButton("Yes", new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        mNotesDatabase.child(list_id).removeValue();
                        notifyDataSetChanged();
                        notifyItemRemoved(position);
                    }
                })
                .setNegativeButton("No", null)
                .show();

        return true;
    }
});

This code is present in: public void onDataChange(DataSnapshot dataSnapshot). When I run my code and try to remove the item from the list, my app crashes. However, it does remove the item in the database itself. I think my app is not updating the FirebaseRecycleAdapter correctly. I tried using notifydatasetchanged(), which resulted in nothing. I also tried to override onChildRemoved. However onChildRemoved appears to not be a function inside FirebaseRecycleAdapter. I also tried to call the FirebaseRecycleAdapter itself, on which it told me it was not initialized.

Here is the logCat:

edit

Below this text you can find the code for the whole adapter as requested:

        final FirebaseRecyclerAdapter<Notes, NotesViewHolder> notesRecyclerViewAdapter = new FirebaseRecyclerAdapter<Notes, NotesViewHolder>(
            Notes.class,
            R.layout.feed_note_single_layout,
            NotesViewHolder.class,
            mNotesDatabase
    ) {

        @Override
        protected void populateViewHolder(final NotesViewHolder viewHolder, Notes model, final int position) {

            final String list_id = getRef(position).getKey();

            mNotesDatabase.child(list_id).addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    final String title = dataSnapshot.child("title").getValue().toString();
                    final String message = dataSnapshot.child("message").getValue().toString();

                    viewHolder.setTitle(title);
                    viewHolder.setMessage(message);

                    viewHolder.mView.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            Intent noteIntent = new Intent(getContext(), NotesActivity.class);
                            noteIntent.putExtra("list_id", list_id);
                            noteIntent.putExtra("title", title);
                            noteIntent.putExtra("message", message);
                            startActivity(noteIntent);

                        }
                    });

                    viewHolder.mView.setOnLongClickListener(new View.OnLongClickListener() {
                        @Override
                        public boolean onLongClick(View v) {
                            new AlertDialog.Builder(getContext())
                                    .setTitle("Are you sure?")
                                    .setMessage("Do you want to delete this note?")
                                    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {



                                            mNotesDatabase.child(list_id).removeValue();
                                            notifyItemRemoved(viewHolder.getAdapterPosition());
                                            notifyDataSetChanged();


                                        }
                                    })
                                    .setNegativeButton("No", null)
                                    .show();

                            return true;
                        }
                    });

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });
        }
    };

    mFeedList.setAdapter(notesRecyclerViewAdapter);