Access a variable of a class stored in an array.

Ok, so I am still new to classes, but I am trying to use it in a pathfinding script. I've started off trying to use a script from a tutorial, but it was in C# and I really just needed to know the grid creation method. So now I have a class.

 class GridCell
 {
 var cellWalkable: boolean;
 var cellHeight: float;
 var cellX: float;
 var cellZ: float;
 var transformPosition: Vector3;
 
 
 
 }

This class is created multiple times to form the grid.

 for(var x = 0; x < mapWidth; x++)
     {
         for(var y = 0; y < mapHeight; y++)
         {
             //Gets the position for a ray
             var currentPosition = topLeftCorner + Vector3(x * cellSize, 0, y * cellSize);
             var hit: RaycastHit;
             //Creates a cell for the grid
             var cell = new GridCell();
             
             //Cast the ray
             if(Physics.Raycast(currentPosition, Vector3(0, -1, 0),hit, bounds.size.y))
             {
                 
                 if(hit.transform.gameObject.layer == walkableLayer)
                 {
                     cell.cellHeight = hit.point.y;
                     cell.cellX = hit.point.x;
                     cell.cellZ = hit.point.z;
                     cell.transformPosition = Vector3(cell.cellX, cell.cellHeight, cell.cellZ);
                     cellArray.Push(cell);    
                 }
             }
         }

At the end of that, I pushed all of the cells into an array called cellArray. In another script called ZombieScript, I am trying to get the transformPosition variable of the cell. I am currently trying to use this.

 function UpdateGrid()
 {
     var currentNode;
     var nearestDistance = Mathf.Infinity;
     
     for(var i = 0; i < navCubeScript.cellArray.length; i++)
     {
         if(Vector3.Distance(transform.position, navCubeScript.cellArray[i].transformPosition) < nearestDistance)
         {
         
         }
     }
     
     
 }

The problem I get, however, is that I get an error saying this.

 'transformPosition' is not a member of 'Object'.

Does anyone have any idea how to get a work around this? Thanks! :D