C# Parent Transform Not Working?

I am trying to get a character to stay on a rotating platform by using a parenting script.

This is the C# script I am currently using: using UnityEngine; using System.Collections;

 public class RotatingCollision : MonoBehaviour {
 
     public Transform rotateTransform = RotatingPlatform.main.transform;
 
     // Use this for initialization
     void OnTriggerEnter (Collider other)
     {
         rotateTransform.parent = transform;
     }
 
     void OnTriggerExit (Collider other)
     {
         Transform.parent = null;
 }
 }

The script reference page says that this is the typical thing to write; but my program calls out the "rotatingTransform = RotatingPlatform.main.transform" and the "Transform.parent = null" as issues.

What am I doing wrong?