Boom menu crash

I'm using boom menu for my first time. I get a error when I run my app:

java.lang.ClassCastException: com.nightonke.boommenu.BoomButtons.TextOutsideCircleButton$Builder cannot be cast to com.nightonke.boommenu.BoomButtons.SimpleCircleButton$Builder

This is my XML file:

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity"><com.nightonke.boommenu.BoomMenuButton        android:id="@+id/bmb"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginEnd="32dp"        android:layout_marginBottom="32dp"        app:bmb_buttonEnum="simpleCircle"        app:bmb_buttonPlaceEnum="buttonPlace_sc_9_1"        app:bmb_normalColor="#64DD17"        app:bmb_piecePlaceEnum="piecePlace_dot_9_1"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintEnd_toEndOf="parent" /></androidx.constraintlayout.widget.ConstraintLayout>

And my JAVA:

    public class MainActivity extends AppCompatActivity {    BoomMenuButton boomMenuButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        boomMenuButton = (BoomMenuButton) findViewById(R.id.bmb);        setbmbtn();    }    private void setbmbtn() {        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Circle"));        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Triangle"));        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Square"));        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Rectangle"));        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Rhombus"));        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Hexagon"));        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Parallelogram"));        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Pentagon"));        boomMenuButton.addBuilder(new TextOutsideCircleButton.Builder().normalText("Trapezoid"));    }}

What is this error and how can I fix it?

I'm a novice developer. Thanks for your help.