shell.resolve not working

languagePath=shell.resolve("lanPack")  --The path of the language pack. Default is "lanPack".

---------------IMPORTANT!!!! READ THIS!!!!----------------
--The language pack is meant to have a format like this:--
--                                                      --
-- language={										   --
--   {"name of 1st language","string 1","string 2"},	--
--   {"name of 2nd language","string 1","string 2"}	 --
-- }													--
--													  --
-- Watch out for commas! Parenthesis have to be braces! --
-- You can print the strings using "lanPrint(key)" and  --
-- "lanPrintCentered(key)", where the key is a number   --
--	 starting from 2 and raising progressively.	   --
--  In the example, lanPrint(2) will print "string 1"   --
--	   and lanPrint(3) will print "string 2".		 --
--	 You can put in as many strings as you want.	  --
------------------Thanks for attention--------------------

if fs.exists(languagePath) then  --Controls if the language pack path is correct. If not,
  os.loadAPI(languagePath)	   --creates a new empty file and returns an error.
  languages=lanPack.languages
else
  lanPack=fs.open("lanPack","w")
  lanPack.write("languages={\n  {}\n}")
  lanPack.close()
  error("The language pack ("..languagePath..") file didn't exist. Now the API have created one empty.")
end

function getTableLength(tab)  --Returns the total amount of keys stored in a table.
  local count = 0
  for _ in pairs(tab) do count = count + 1 end
  return count
end

function selector(yIn,yOut) --Gets the start y, the end y and makes a ">" selector.
  term.setCursorPos(1,yIn)  --You need to put the text you want to choose from one space from the left border (x=2)
  write(">")				--Returns the number of the choice(Eg, returns 1 if you select the first, 2 for the second...)
  enter=false
  while not enter do
	x,yAct=term.getCursorPos()
	ev,key=os.pullEvent("key")
	if key==28 then
enter=true
return yAct-yIn+1
	elseif key==200 then
if not ((yAct-1)<yIn) then
   term.setCursorPos(1,yAct)
   write(" ")
   yAct=yAct-1
   term.setCursorPos(1,yAct)
   write(">")
end
	elseif key==208 then
if not ((yAct+1)>yOut) then
   term.setCursorPos(1,yAct)
   write(" ")
   yAct=yAct+1
   term.setCursorPos(1,yAct)
   write(">")
end
	end
  end
end

function selectLanguage()  --Makes a list of the aviable languages (the first string) and makes a selection
  x,y=term.getCursorPos()  --using the selector() function.
  for key in pairs(languages) do
	print(" "..tostring(languages[key][1]))
  end
  sel=selector(y,(getTableLength(languages)+y-1))
  language=languages[sel]
end

function getLanguage()  --Just returns the name of the language selected.
  return language[1]
end

function lanPrint(n)  --Prints the string associated to the key used in the parameter.
  print(language[n])  --Usually a progressive number.
end

function lanPrintCentered(n) --Prints the string associated to the key used in the parameter.
  str=language[n]			--This time it also align the text centraly
  w,h=term.getSize()
  x=(w-math.floor(#str))/2
  oldx,y=term.getCursorPos()
  term.setCursorPos(x,y)
  print(str)
end