Last ckeck fails

package de.codegym.task.task08.task0824; /* Eine Familie gründen */ import java.util.ArrayList; public class Solution { public static void main (String[] args) { ArrayList<Mensch> noChild = new ArrayList<>(); // empty List because a constructor without a list does not work with this toString() Mensch c1 = new Mensch("C1", true, 12, noChild); // create 3 children Mensch c2 = new Mensch("C2", false, 8, noChild); Mensch c3 = new Mensch("C3", true, 4, noChild); ArrayList<Mensch> grandChild = new ArrayList<>(); // add them to the grandchildren list grandChild.add(c1); grandChild.add(c2); grandChild.add(c3); Mensch v1 = new Mensch("V1", true, 50, grandChild); // create parents Mensch m1 = new Mensch("M1", false, 50, grandChild); ArrayList<Mensch> child = new ArrayList<>(); // add parents to a seperate children list child.add(v1); child.add(m1); Mensch gv1 = new Mensch("GV1", true, 78, child); // create grandparents Mensch gv2 = new Mensch("GV2", true, 75, child); Mensch gm1 = new Mensch("GM1", false, 78, child); Mensch gm2 = new Mensch("GM2", false, 75, child); System.out.println(gv1.toString()); // use the toString method to print System.out.println(gv2.toString()); System.out.println(gm1.toString()); System.out.println(gm2.toString()); System.out.println(v1.toString()); System.out.println(m1.toString()); System.out.println(c1.toString()); System.out.println(c2.toString()); System.out.println(c3.toString()); } public static class Mensch { String name; boolean geschlecht; int alter; ArrayList<Mensch> kinder; public Mensch (String v1, boolean b, int i, ArrayList<Mensch> grandChild) { // constructor for class Mensch this.name = v1; this.geschlecht = b; this.alter = i; this.kinder = grandChild; } public String toString () { String text = ""; text += "Name: " + this.name; text += ", Geschlecht: " + (this.geschlecht ? "männlich" : "weiblich"); text += ", Alter: " + this.alter; int anzahlKinder = this.kinder.size(); if (anzahlKinder > 0) { text += ", Kinder: " + this.kinder.get(0).name; for (int i = 1; i < anzahlKinder; i++) { Mensch kind = this.kinder.get(i); text += ", " + kind.name; } } return text; } } }