PROBLEM: parent of recttransform is being set with parent property.

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C#

Unity2D

i want to save prefab between the scenes, it is something like inventory, and i have this:

Parent of RectTransform is being set with parent property. Consider using the SetParent method instead, with the worldPositionStays argument set to false. This will retain local orientation and scale rather than world orientation and scale, which can prevent common UI scaling issues.
UnityEngine.Transform:set_parent (UnityEngine.Transform)

who knows how to solve?

What I have tried:

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


public class SAveOnLoad : MonoBehaviour
{

public GameObject ChildObj;
void Start()
{
    ChildObj.transform.parent = null;
}
void Update()
{

DontDestroyOnLoad(ChildObj);
}
}