SendMessage GatherEnergy has no receiver

Can someone explain to me why this setup I have is incorrect. I believed I had used the SendMessage method correct but the compiler is yelling at me that its not. Thank you for your time.

Here is the two codes I am using:

The first one.

 using UnityEngine;
 using System.Collections;
 
 public class EnemyHealth : MonoBehaviour 
 {
     public float maxHealth = 10.0f;
     private float currentHealth;
     public GameObject deathEffect;
     public GameObject damageEffect;
     public string collisionTag = "PlayerBullets";
 
     public int theEnergy = 20;
     private GameObject secondFormManager;
 
 
     // Use this for initialization
     void Start () 
     {
         currentHealth = maxHealth;
         secondFormManager= GameObject.FindGameObjectWithTag ("SecondFormManager");
     }
 
     void OnTriggerEnter(Collider col)
     {
         if(col.tag == collisionTag)
         {
             currentHealth -= 1.0f;
             Instantiate(damageEffect,col.ClosestPointOnBounds(transform.position), Quaternion.identity);
 
             if(currentHealth <= 0)
             {
                 Instantiate(deathEffect, transform.position, Quaternion.identity);
 
                 Destroy(gameObject);
                             //THE SENDER CODE
                 secondFormManager.SendMessage ("GatherEnergy", 20.0f);
             }
         }
     }
 }

The second one.

 using UnityEngine;
 using System.Collections;
 
 public class ChangeToSecondForm : MonoBehaviour 
 {
     private static ChangeToSecondForm instance = null;
     public static ChangeToSecondForm Instance
     {
         get {return instance; }
     }
 
     private GameObject playerToBeChangedFrom;
     private GameObject playerChangingTo;
 
     public Transform secondFormDisplay;
     public float maxEnergy = 100.0f;
     public float currentEnergy;
     private float energyOriginalXScale;
 
     // Use this for initialization
     void Start () 
     {
         currentEnergy = 0.0f;
         energyOriginalXScale = secondFormDisplay.localScale.x;
         playerToBeChangedFrom = GameObject.FindGameObjectWithTag ("PlayerCharacter");
         playerChangingTo = GameObject.FindGameObjectWithTag ("PlayerCharacterSecondForm");
         playerChangingTo.SetActive (false);
     }
     
     // Update is called once per frame
     void Update () 
     {
         if (currentEnergy <= 0) 
         {
             secondFormDisplay.GetComponentInChildren<Renderer>().enabled = false;
         }
 
         SecondForm ();
     }
 
     public void SecondForm()
     {
         if (Input.GetButtonDown ("TransformToSecond") && (currentEnergy == 100)) 
         {
             Debug.Log("Q has been pressed");
             currentEnergy = 0;
 
             playerToBeChangedFrom.SetActive (false);
             playerChangingTo.SetActive(true);
 
             playerChangingTo.SendMessage ("TransformQueSound", true); 
 
 
             Invoke ("ChangeBack", 10.0f);
         }
     }
 
     public void ChangeBack ()
     {
         playerToBeChangedFrom.SetActive (true);
         playerChangingTo.SetActive (false);
     }
 
 //THE RECEIVING CODE
     public void GatherEnergy(float energyGathered)
     {
         Debug.LogError ("Got Energy from dead enemy.");
         
         currentEnergy += energyGathered;
 
         if (currentEnergy >= 100) 
         {
             currentEnergy = 100.0f;
         }
 
         secondFormDisplay.localScale = new Vector3(energyOriginalXScale * (currentEnergy/maxEnergy), secondFormDisplay.localScale.z, secondFormDisplay.localScale.z);
     }
 }