[Lua] File:lines() doesn't work anymore?

function loadLevel()
player = nil
pieces = nil
local file = io.open("/pec/levels/"..level..".nfa","r")
local y = 1
local row = { }
for lines in file:lines() do
  for x=1,#lines do
   row[y][x] = lines:sub(x,x)
  end
  local char = row[y][x]
  if char == "p" then
   player = loadSprite("pec/player.nfa",x,y)
  elseif char == "1" or char == "2" then
   table.insert(pieces,loadSprite(piecesPaths[tonumber(char)]))
  end
  y = y + 1
end
file:close()
end