I finished my Level Generation script, I made a few typos?

My World Generation script isn't working, if world generation doesn't work, I don't know what I will do.

Code (Note: Very long)

local prefabs = game.ServerStorage.Prefabs
local cubes = 90
local width = 256
local length = 256
local height = 64
local x = -0.5
local y = 3
local z = 1.5
local rows = 1
local w = 0
local l = 0
local h = 0
local chance = 0
math.randomseed(tick())

--Void
function DrawBlock(block,xp,yp,zp,location,num)
  if num == "" then
     local newBlock = Prefabs[block]:Clone()
     newBlock.Parent = location
     newblock.size = Vector3.new(5,5,5)
     newBlock.CFrame = CFrame.new(xp,yp,zp)
  else
    local newBlock = prefabs[block]:Clone()
    newBlock.Parent = location
    newblock.size = Vector3.new(5,math.random(0,3),5)
    newBlock.CFrame = CFrame.new(xp,yp,zp)  
end
end

for i=1,width,1 do
  for i=-1,length,1 do
    for i=1,height,1 do
        wait()
        if w == width then
        w=0
        rows=rows+1
        x=x-3
        z=1.5
        print()
        l=l+1
        elseif l==length then
            print(h)
            h=h+1
            w=0
            l=0
            z=1.5
            x=-0.5
            y=y-3
        elseif h == height then
            break
        else
            chance = math.random(0,3)
            if chance >0.15 and chance >0.7 then
                DrawBlock("Grass 2",x,y,z,workspace.Level,"")
            else
                DrawBlock("Stone 2",x,y,z,workspace.Level,"")
            end
            w=w+1
            z=z+(-3)
          end
        end 
      end
    end
    repeat wait() until h == height
    break
  else
    chance = math.random(0,3)
    if chance >2 then
                DrawBlock("Grass Block",x,y,z,workspace.Level,chance)
            else
                DrawBlock("Stone Block",x,y,z,workspace.Level,chance)
end