Question DOES galacticKittens doesnt work anymore?

i dowlloaded the galacticKittens from your site and i t has some problems - i wonder if it is on my end or does the galacticKittens sample doesnt work anymore?

i put below the the error i get

************************************************
maybe its related to this script

using Unity.Netcode;
using UnityEngine;
/*
Generic classes for the use of singleton
there are 3 types:
- MonoBehaviour -> for the use of singleton to normal MonoBehaviours
- NetworkBehaviour -> for the use of singleton that uses the NetworkBehaviours
- Persistent -> when we need to make sure the object is not destroyed during the session
*/
public class Singleton<T> : MonoBehaviour where T : Component
{
public static T Instance { get; private set; }
public virtual void Awake()
{
if (Instance == null)
{
Instance = this as T;
}
else
{
Destroy(gameObject);
}
}
}
public class SingletonPersistent<T> : MonoBehaviour where T : Component
{
public static T Instance { get; private set; }
public virtual void Awake()
{
if (Instance == null)
{
Instance = this as T;
DontDestroyOnLoad(this);
}
else
{
Destroy(gameObject);
}
}
}
public class SingletonNetwork<T> : NetworkBehaviour where T : Component
{
public static T Instance { get; private set; }
public virtual void Awake()
{
if (Instance == null)
{
Instance = this as T;
}
else
{
Destroy(gameObject);
}
}
}
public class SingletonNetworkPersistent<T> : NetworkBehaviour where T : Component
{
public static T Instance { get; private set; }
public virtual void Awake()
{
if (Instance == null)
{
Instance = this as T;
DontDestroyOnLoad(this);
}
else
{
Destroy(gameObject);
}
}
}

******************************
Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP: (0,0): error - System.NullReferenceException: Object reference not set to an instance of an object.|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.GenerateVariableInitialization(TypeDefinition type)|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.GenerateVariableInitialization(TypeDefinition type)|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.ProcessNetworkBehaviour(TypeDefinition typeDefinition, String[] assemblyDefines)|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.<>c__DisplayClass7_0.<Process>b__1(TypeDefinition b)|| at System.Collections.Generic.List`1.ForEach(Action`1 action)|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.Process(ICompiledAssembly compiledAssembly) at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.GenerateVariableInitialization(TypeDefinition type)|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.GenerateVariableInitialization(TypeDefinition type)|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.ProcessNetworkBehaviour(TypeDefinition typeDefinition, String[] assemblyDefines)|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.<>c__DisplayClass7_0.<Process>b__1(TypeDefinition b)|| at System.Collections.Generic.List`1.ForEach(Action`1 action)|| at Unity.Netcode.Editor.CodeGen.NetworkBehaviourILPP.Process(ICompiledAssembly compiledAssembly)

 

2022 lts or last one - 2023.15 (maybe the paccakges also not correct somhow?)