if error

[tbutton]

    type Cell = object
        x,y:int
    
    let Size = 2345
    
    #...
    
    for i in countup(1,Map.high,2):
        for j in countup(1, Map[i].high,2):
          var direction = random.sample( [if j+1 > 0 and j+1 < Size: 
Cell(x:j+1, y:i) else: NaN, if i+1 > 0 and i+1 < Size: Cell(x:j, y:i+1) else: 
NaN]  )
    
    
    Run
    
    
    /home/max/project/maze_generator/maze.nim(30, 91) Error: type mismatch: got 
<float64> but expected 'Cell = object'
    
    Run

why do i get this error? What is wrong? Help me pls