Initialize Vector3 2 Dimensional Array

I want to create 2 dimensional Vector3 array. I used following way but can't able to find correct way to create it.

 public static class AdhocStorage{
 
     public static Vector3 [,] CELL_POSITION_PORTRAIT = {
         
         {new Vector3(-5.7f, 7.1f, -3.0f),new Vector3(-4.3f, 7.1f, -3.0f),new Vector3(-2.8f, 7.1f, -3.0f),new Vector3(-1.4f, 7.1f, -3.0f),new Vector3(0.0f, 7.1f, -3.0f),new Vector3(1.5f, 7.1f, -3.0f),new Vector3(2.9f, 7.1f, -3.0f),new Vector3(4.3f, 7.1f, -3.0f),new Vector3(5.7f, 7.1, -3.0f)},
         {new Vector3(-5.7f, 5.7f, -3.0f),new Vector3(-4.3f, 5.7f, -3.0f),new Vector3(-2.8f, 5.7f, -3.0f),new Vector3(-1.4f, 5.7f, -3.0f),new Vector3(0.0f, 5.7f, -3.0f),new Vector3(1.5f, 5.7f, -3.0f),new Vector3(2.9f, 5.7f, -3.0f),new Vector3(4.3f, 5.7f, -3.0f),new Vector3(5.7f, 5.7, -3.0f)},
         {new Vector3(-5.7f, 4.3f, -3.0f),new Vector3(-4.3f, 4.3f, -3.0f),new Vector3(-2.8f, 4.3f, -3.0f),new Vector3(-1.4f, 4.3f, -3.0f),new Vector3(0.0f, 4.3f, -3.0f),new Vector3(1.5f, 4.3f, -3.0f),new Vector3(2.9f, 4.3f, -3.0f),new Vector3(4.3f, 4.3f, -3.0f),new Vector3(5.7f, 4.3, -3.0f)},
         {new Vector3(-5.7f, 2.9f, -3.0f),new Vector3(-4.3f, 2.9f, -3.0f),new Vector3(-2.8f, 2.9f, -3.0f),new Vector3(-1.4f, 2.9f, -3.0f),new Vector3(0.0f, 2.9f, -3.0f),new Vector3(1.5f, 2.9f, -3.0f),new Vector3(2.9f, 2.9f, -3.0f),new Vector3(4.3f, 2.9f, -3.0f),new Vector3(5.7f, 2.9, -3.0f)},
         {new Vector3(-5.7f, 1.5f, -3.0f),new Vector3(-4.3f, 1.5f, -3.0f),new Vector3(-2.8f, 1.5f, -3.0f),new Vector3(-1.4f, 1.5f, -3.0f),new Vector3(0.0f, 1.5f, -3.0f),new Vector3(1.5f, 1.5f, -3.0f),new Vector3(2.9f, 1.5f, -3.0f),new Vector3(4.3f, 1.5f, -3.0f),new Vector3(5.7f, 1.5, -3.0f)},
         {new Vector3(-5.7f, 0.1f, -3.0f),new Vector3(-4.3f, 0.1f, -3.0f),new Vector3(-2.8f, 0.1f, -3.0f),new Vector3(-1.4f, 0.1f, -3.0f),new Vector3(0.0f, 0.1f, -3.0f),new Vector3(1.5f, 0.1f, -3.0f),new Vector3(2.9f, 0.1f, -3.0f),new Vector3(4.3f, 0.1f, -3.0f),new Vector3(5.7f, 0.1, -3.0f)},
         {new Vector3(-5.7f, -1.4f, -3.0f),new Vector3(-4.3f, -1.4f, -3.0f),new Vector3(-2.8f, -1.4f, -3.0f),new Vector3(-1.4f, -1.4f, -3.0f),new Vector3(0.0f, -1.4f, -3.0f),new Vector3(1.5f, -1.4f, -3.0f),new Vector3(2.9f, -1.4f, -3.0f),new Vector3(4.3f, -1.4f, -3.0f),new Vector3(5.7f, -1.4f, -3.0f)},
         {new Vector3(-5.7f, -2.8f, -3.0f),new Vector3(-4.3f, -2.8f, -3.0f),new Vector3(-2.8f, -2.8f, -3.0f),new Vector3(-1.4f, -2.8f, -3.0f),new Vector3(0.0f, -2.8f, -3.0f),new Vector3(1.5f, -2.8f, -3.0f),new Vector3(2.9f, -2.8f, -3.0f),new Vector3(4.3f, -2.8f, -3.0f),new Vector3(5.7f, -2.8f, -3.0f)},
         {new Vector3(-5.7f, -4.2f, -3.0f),new Vector3(-4.3f, -4.2f, -3.0f),new Vector3(-2.8f, -4.2f, -3.0f),new Vector3(-1.4f, -4.2f, -3.0f),new Vector3(0.0f, -4.2f, -3.0f),new Vector3(1.5f, -4.2f, -3.0f),new Vector3(2.9f, -4.2f, -3.0f),new Vector3(4.3f, -4.2f, -3.0f),new Vector3(5.7f, -4.2f, -3.0f)}
         
     } ;
 }

Unity gives me following error.

Please help me to solve this problem.