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Android Build an Interactive Story App User Input Finding Views by IDs

I dont get what i did wrong?

i used the code from the my last project that worked to answer this question and it doesnt work for some reason ?

MainActivity.java
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    protected Button exterminateButton;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Declare our view variables
        exterminateButton = findViewById(R.id.button1);
    }

}