C# Script compile error in unity

I have this code.

Code:

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using UnityEngine;
using System.Collections;

public class Spawner : MonoBehaviour {

        public GameObject [] groups ;

        void start(){
                spawnNext ();
        }

        void spawnNext () {
                int i = Random.Range (0, groups.Length);
               
                Increment (groups[i],
                          transform.position,
                          Quaternion.identity);
        }
}

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This program is supposed to take a prefab block and spawn it at the top of my screen, like in Tetris. However, when I run it in Unity it says that there is a compiler error. Is there something wrong with my program or with unity?

Quote:

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Originally Posted by DeathFromAbove

However, when I run it in Unity it says that there is a compiler error. Is there something wrong with my program or with unity?

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There is something wrong with your post because you neglected to include the error.