Cannot resolve method 'query(java.lang.String, null)'

I have created a film database app where a user can search for a film, which will then display in a scrollView, the user can click on their search results and click a button to add this to a favourites list. I have the above error on my cursor query, which is set under my onClick method for my favourites button.

Any idea why I have this error? The error appears on 'Cursor c db.query' line.

public class MainActivity4 extends ActionBarActivity {

String filmId;
SQLiteDatabase db;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.details);

    Intent intent = getIntent();
    filmId= intent.getStringExtra(MainActivity.FILM_ID_KEY);

    TextView txtFilm = (TextView) findViewById(R.id.txtFilm);
    TextView txtActor = (TextView) findViewById(R.id.txtActor);
    TextView txtActor2 = (TextView) findViewById(R.id.txtActor2);
    TextView txtDirector = (TextView) findViewById(R.id.txtDirector);
    TextView txtDescription = (TextView) findViewById(R.id.txtDescription);

    db = new DbHelper(this).getReadableDatabase();
    String[] column = {"*"};
    String where = "id=?";
    String[] selArgs = {filmId};
    Cursor film = db.query("FILMTABLE", column, where, selArgs, null, null, null);

    film.moveToFirst();
    txtFilm.setText(film.getString(film.getColumnIndex("film")));
    txtActor.setText(film.getString(film.getColumnIndex("actor")));
    txtActor2.setText(film.getString(film.getColumnIndex("actor2")));
    txtDirector.setText(film.getString(film.getColumnIndex("director")));
    txtDescription.setText(film.getString(film.getColumnIndex("description")));
    db.close();

public void AddFav(View v){
    db = new DbHelper(this).getWritableDatabase();
    Cursor c = db.query ("SELECT FAVOURITE FROM FILMTABLE WHERE id=" + filmId, null);
    ContentValues cv = new ContentValues();
    cv.put("FAVOURITE", 1);
    String where = "id=?";
    String[] selArgs = {filmId};
    db.update("FILMTABLE", cv, where, selArgs);
}
}