C# Unity gereksiz yere hata veriyor

public class ZeminGeneratour : MonoBehaviour
{
    public GameObject zemin;
  
    public Transform tr;

    public int zeminsayisi;

    public float zemingenislik;

    public float minimumy, maksimumy;

    private void Start() {
        tr = zemin.GetComponent<Transform>();
        Vector3 spawnkonumu = new Vector3();
        Vector2 yeniscale = new Vector2();

        for(int i = 0 ,i <zeminsayisi, i++)
        {
            yeniscale.x = Random.Range(0.9f,1.1f);
            yeniscale.y = Random.Range(0.9f,1.1f);
            tr.localScale = yeniscale;

            spawnkonumu.y += Random.Range(minimumy, maksimumy);
            spawnkonumu.x = Random.Range(-zemingenislik,zemingenislik);

            Instantiate(zemin,spawnkonumu,Quaternion.identity);
        }
    }
}