I do not work the buttons in the activity

I'm following a tutorial to make an application and the calculate button does not work for me. This button, when indicating a quantity in the inputBill and clicking on the button should leave me a text with the calculated tip, but it does not do anything.

then my elements in the layout.

<EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="numberDecimal"
        android:hint="@string/main.hint.bill"
        android:ems="10"
        android:id="@+id/inputBill"
        android:layout_gravity="center_horizontal"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/main.button.submit"
        android:id="@+id/btnSubmit"
        android:layout_alignParentTop = "true"
        android:layout_toRightOf="@+id/inputBill"
        android:layout_toEndOf="@+id/inputBill"

        />
<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/activity_horizontal_margin"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:id="@+id/txtTip"
        android:layout_below="@id/separator"
        android:visibility="gone"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        />

I leave the code I have so far,

@BindView(R.id.inputBill)
    EditText inputBill;
    @BindView(R.id.btnSubmit)
    Button btnSubmit;
    @BindView(R.id.inputPercentage)
    EditText inputPercentage;
    @BindView(R.id.btnIncrease)
    Button btnIncrease;
    @BindView(R.id.btnDecrease)
    Button btnDecrease;
    @BindView(R.id.btnClear)
    Button btnClear;
    @BindView(R.id.separator)
    View separator;
    @BindView(R.id.txtTip)
    TextView txtTip;


    private final static int TIP_STEP_CHANGE = 1;
    private final static int DEFAULT_TIP_PERCENTAGE = 10;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

    }


    @OnClick(R.id.btnSubmit)
    public void handleClickSubmit() {
      //  hideKeyBoard();
        String strInputTotal = inputBill.getText().toString().trim();
        if (!strInputTotal.isEmpty()) {
            double total = Double.parseDouble(strInputTotal);
            int tipPercentage = getTipPercentage();
            double tip = total * (tipPercentage / 100d);

            String strTip = String.format(getString(R.string.global_message_tip), tip);
            // log.d("no se crea la variable strtip");
            Log.d("txtTip", "error encontrado");
            txtTip.setVisibility(View.VISIBLE);
            txtTip.setText(strTip);

        }
    }

I do not have errors in the code, compile but something wrong I'm doing and I do not know ...

Hello, I'll show you the screenshot of the logcat. one of the errors that I had session 'app' error lauching activity no longer I have it when deactivating in settings the auto run ....