Assets\SampleScenes\Scripts\Coin.cs(29,49): error CS0029: Cannot implicitly convert type 'UnityEngine.GameObject' to 'UnityEngine.GameObject[]'

I am new to coding can somebody please help me fix this?

using UnityEngine; using System.Collections;

public class Coin : MonoBehaviour { // Keeps track of total coin count in scene public static int CoinCount = 0;

 void Start ()
 {
     //Object created, increment coin count
     ++Coin.CoinCount;
 }

 // Called when object is destroyed
 void OnTriggerEnter(Collider Col)
 {
     //if player collected coin, then destroy object

     if (Col.CompareTag ("Player"))
     {
         Destroy(gameObject);
     }

         if(Coin.CoinCount <= 0)
         {
             GameObject Timer = GameObject.Find("LevelTimer");
             Destroy(Timer);
             GameObject [] FireworkSystems = GameObject.FindGameObjectWithTag("Fireworks");
             if (FireworkSystems.Length <= 0) { return; }
             foreach(GameObject GO in FireworkSystems)
             {
                 GO.GetComponent<ParticleSystem>().Play();
             }
         }
 }

},I can't seem to figure out what is wrong with my code. I am new to game design and currently in school for it. Can somebody please try and help me?

using UnityEngine; using System.Collections;

public class Coin : MonoBehaviour { // Keeps track of total coin count in scene public static int CoinCount = 0;

 void Start ()
 {
     //Object created, increment coin count
     ++Coin.CoinCount;
 }

 // Called when object is destroyed
 void OnTriggerEnter(Collider Col)
 {
     //if player collected coin, then destroy object

     if (Col.CompareTag ("Player"))
     {
         Destroy(gameObject);
     }

         if(Coin.CoinCount <= 0)
         {
             GameObject Timer = GameObject.Find("LevelTimer");
             Destroy(Timer);
             GameObject [] FireworkSystems = GameObject.FindGameObjectWithTag("Fireworks");
             if (FireworkSystems.Length <= 0) { return; }
             foreach(GameObject GO in FireworkSystems)
             {
                 GO.GetComponent<ParticleSystem>().Play();
             }
         }
 }

}