Why is the handler method not called when the button is clicked (Data Binding)?

Question

Android

I am using Data Binding. In the EventHandlers class, I implemented a click handler, but when I click on the button, this handler is not called.

<data>
        <variable
            name="model"
            type="com.codit.planit.viewmodel.RegisterViewModel" />

        <variable
            name="handler"
            type="com.codit.planit.handler.EventHandlers" />
</data>

...

<Button
            android:id="@+id/sign_up_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/confirm_pass_input"
            android:layout_centerHorizontal="true"
            android:layout_marginStart="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            android:text="@string/sign_up"
            android:onClick="@{() -> handler.onSignUpClick(model)}"
            style="@style/buttonStyle"/>

Handler class:

public class EventHandlers {
    public void onSignInClick(LoginViewModel model){
        model.signIn();
    }
    public void onSignUpClick(RegisterViewModel model) {
        model.signUpWithEmailAndPassword();
    }

}

Binding:

ActivityRegisterBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_register);
        binding.setModel(ViewModelProviders.of(this).get(RegisterViewModel.class));
        binding.setHandler(new EventHandlers());

Can you please tell me why the handler.onSignUpClick(model) method is not called? Thanks in advance for your help.