Error CS0116 : A namespace can only contain types and namespace declarations. PLEASE HELP ME!

Questions & Answers
1

Here is my C# script that is attached to my coins. The error is on (4,6)

using UnityEngine;
using System.Collections;

void OnTriggerEnter(Collider other)
{
	if(other.gameObject.tag == "Coin")
	{
		other.gameObject.SetActive = false;
	}
}
2

you need to wrap a class around your OnTriggerEnter function like this:

using UnityEngine;
using System.Collections;

public class MyClassName : MonoBehaviour {

    void OnTriggerEnter(Collider other)
    {
         if(other.gameObject.tag == "Coin")
         {
             other.gameObject.SetActive = false;
         }
    }
}