Co robię źle? / What is wrong with this code?

package pl.codegym.task.task03.task0307; /* Witaj, StarCraft! */ public class Solution { public static void main(String[] args) { //tutaj wpisz swój kod Zerg zerg = new Zerg(); zerg.imie = "barnaba"; Zerg zerg1 = new Zerg(); zerg.imie = "barnaba1"; Zerg zerg2 = new Zerg(); zerg.imie = "barnaba2"; Zerg zerg3 = new Zerg(); zerg.imie = "barnaba3"; Zerg zerg4 = new Zerg(); zerg.imie = "barnaba4"; Protoss protoss = new Protoss(); protoss.imie = "barnaba5"; Protoss protoss1 = new Protoss(); protoss.imie = "barnaba6"; Protoss protoss2 = new Protoss(); protoss.imie = "barnaba7"; Terranin terranin = new Terranin(); terranin.imie = "barnaba9"; Terranin terranin1 = new Terranin(); terranin.imie = "barnaba10"; Terranin terranin2 = new Terranin(); terranin.imie = "barnaba11"; Terranin terranin3 = new Terranin(); terranin.imie = "barnaba12"; } public static class Zerg { public String imie; } public static class Protoss { public String imie; } public static class Terranin { public String imie; } }