Setting the parent of a transform which resides in a Prefab Asset is disabled to prevent data corruption

Hi guys, I am facing this problem again and again. I cannot find solution. I think my code is right, but where is the problem? GameObject visual = Instantiate(placementObject[num], hit.point + visualOffset, Quaternion.identity); visual.transform.SetParent(parentObject.transform); I got error message on this line -> visual.transform.SetParent(parentObject.transform);