third person controller makes my character fall through the

CAN I ASK HERE ?

I know this is a hard one so a big thanks in advance. So I have this game called borda and the world is made of many many cubes. I can't figure out how to save it all with out the game crashing. So if you guys can help me have unity save and load all this stuff I would be very thankfull. This is how it looks /HERE IS SAVING WRITTEN CAN I ASK YOU TO WRITE LOADING FOR IT TO BRING IT PERFECTLY BACK TO SCENE?

using UnityEngine; using System.Collections; using System.IO;

public class SaveGame : MonoBehavior { public GameObject[] cubes; protected string savename = "savegame";

 private void Start()
 {
    cubes = FindGameObjectsWithTag("Floor");
 }
 
 public IEnumerator Save()
 {
    foreach(GameObject cube in cubes)
    {
      Vector3 pos = cube.transform.position;
      Quaternion rot = cube.transform.rotation;
 
      AddCube(pos, rot);
 
      yield return new WaitForSeconds(0.01f);
    }
 }
 
 public void AddCube(Vector3 pos, Quaternion rot)
 {
    float[] xyz = new float[3], hpb = new float[3];
         // Pos                 Rot
    xyz[0] = pos.z; xyz[1] = pos.y; xyz[2] = pos.z;
    pos[0] = rot.z; pos[1] = rot.y; pos[2] = rot.z;
 
    if(File.Exists("saves/" + savename + ".txt"))
    {
      using(StreamReader saveFile = File.OpenText("saves/" + savename + ".txt"))
      {
       foreach(float item in xyz)
       {
           saveFile.Write(item.ToString("R"));
       }
       saveFile.Write("-"); // Separator
       foreach(float item in hpb)
       {
           saveFile.Write(item.ToString("R"));
       }
       saveFile.Write("\n"); // Line break
      }
    }else{
      using(StreamWriter saveFile = File.CreateText("saves/" + savename + ".txt"))
      {
       foreach(float item in xyz)
       {
           saveFile.Write(item.ToString("R"));
       }
       saveFile.Write("-"); // Separator
       foreach(float item in hpb)
       {
           saveFile.Write(item.ToString("R"));
       }
       saveFile.Write("\n"); // Line break
      }
    }
 }

}

AND HAVE 100 VERSIONS OF LOADING IF SOME TRIES TO KEEP IT UANSWEWRED