Unable to attach World.cs and Chunk.cs script into respective game objects

[user3D-design]

I am getting the following message while I am trying to attach World.cs and Chunk,cs script into the respective game objects.
"The script don't inherit a native class that can manage a script"
Please suggest what needs to be done.

Code_Chunk.cs.txt
Code_World.cs.txt

Thanks in advance

[gregdev00]

Might be a little late with this, but the issue you have is likely because of the naming of the files/classes.
The attached scripts in your comment are named Code_Chunk.cs and Code_World.cs, but they should be Chunk.cs and World.cs as the class names inside them are called Chunk and World

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Chunk : MonoBehaviour {
  ....
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class World : MonoBehaviour {
 ....
}

So the solution is that you either do ONLY ONE (1. or 2.) of the things below:

1. Rename the files: Code_Chunk.cs to Chunk.cs and Code_World.cs to World.cs
2. Rename the class names: public class Chunk : MonoBehaviour to public class Code_Chunk : MonoBehaviour and public class World : MonoBehaviour to public class Code_World : MonoBehaviour