Error with symbol variables

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

    // Declare our view variables and assign them the views from the layout file.
    final TextView factLabel = (TextView) findViewById(R.id.factTextView);
    Button showFactButton = (Button) findViewById(R.id.showFactButton);
    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // The button was clicked to update the fact label with a new fact
            String fact = "Ostriches can run faster then horses";
            factLabel.setText(fact);
        }
    };
    showFactButton.setOnClickListener(listener);
}