GameObject Array index out of bound

It sounds silly but I'm stuck here with this error.

I've declared an array like this:

Code (csharp):

1.  
2. int x = 0;
3. public GameObject[] emptyArr = new GameObject[5];

And I was trying to assign it a game object like this:

Code (csharp):

1.  
2. print("x" + x);
3. // print("x" + emptyArr[x]);
4. emptyArr[x] = (GameObject)Instantiate(obstacle, new Vector3(transform.localPosition.x + 5.0f, y, 0),Quaternion.identity) as GameObject;
5. x++;
6.  

And it throws:

Code (csharp):

1. IndexOutOfRangeException: Array index is out of range.
2. (wrapper stelemref) object:stelemref (object,intptr,object)
3. SpawnObstacle.Spawn () (at Assets/SpawnObstacle.cs:81)

I'm not trying to "access" the game object array, but I was trying to assign something to it, then why throw this error in the first place?

 

It's ok, I've solved it.... the problem was I declared GameObject as Public..

 

Oh,I got same problem, thank you!