Destroy an instantce of a prefab object

Greetings all I have researched this for days. Found many answer to similar questions.

Here is the short of it. Latest version of unity3d free one Doing a 2D shoot ( start from the basic I always say )

I have a fighter and a enemy. all works great. They ram each other they die. Fighter shoots and kills enemy.

But the explosion never go away.

Explosion are Particle systems. They are prefabs.

When the player kills the enemy or both collide: I call this when killing the enemy, top of the call public GameObject explosion; public GameObject playerExplosion;

if ( other.gameObject.name.Contains("enemy") && other.gameObject.GetComponent().hp < 1 ) { Instantiate(explosion, other.gameObject.transform.position, other.gameObject.transform.rotation); explosion.name ="EnemyExplosion";

 Destroy( other.gameObject );
 Destroy( this.explosion,1 );
 }

I have tried Destroy(gameObject); Destroy(gameobject, 1); When I do this unity tells me quote Destroying assets is not permitted to avoid data loss. If you really want to remove an asset use DestroyImmediate (theObject, true); UnityEngine.Object:Destroy(Object, Single) DestroyOnContact:DestroyEnemy(GameObject) (at Assets/Scripts/DestroyOnContact.cs:63) HealthScript:Damage(Int32) (at Assets/Scripts/HealthScript.cs:64) HealthScript:OnTriggerEnter2D(Collider2D) (at Assets/Scripts/HealthScript.cs:78) end quote

So I try using DestroyImmediate (theObject, true); it tell me to use Destroy.

I have tried Destroy(explosion); same thing unity tells me.

I tried to add the prefab of the explosion to the enemy or player object as a child hoping it would destroy but I cannot figure how to add it as a child.

So how do you in C# get rid of an instance of a prefab?

That's it

Thanks all