cant change color of gameobject unity code example

Example: unity c# change color of gameobject

using UnityEngine; 
using System.Collections; 

public class collisionpill : MonoBehaviour 
{      
  	public Color mycolor;       
  	
  	void OnCollisionEnter(Collision other) 
    {         
        if (other.transform.tag == "Pill") 
        {             
        	gameObject.GetComponent<Renderer>().material.color = mycolor;
        }    
    }
}