Android : eclipse changing text on button click

I'm experiencing some probles with my andorid app I'm currently developing in eclipse bundle. I want to make a simple text change on a button click but unfortunately, when I run the app on my device it stops working. The app crashes on my device, but has no errors in eclipse.

This is my code:

final TextView chores = (TextView) findViewById(R.id.chores);
Button choreButton = (Button) findViewById(R.id.choreButton);

View.OnClickListener listener = new View.OnClickListener() {

    @Override
    public void onClick(View v) {

        String next = "Go make some Coffee.";
        chores.setText(next);

    }
};
choreButton.setOnClickListener(listener);

Thanks for your help! :)