I fixed it, If you want the working code, here 
–Hide the status bar
display.setStatusBar(display.HiddenStatusBar)
–Saving/Loading Stuff
local ego = require “ego”
local saveFile = ego.saveFile
local loadFile = ego.loadFile
–Create the background and make it blue
local bg = display.newRect( 0, 0, 320, 480 )
bg:setFillColor( 150, 180, 200 )
–Start the score at 0
local score = 0
–Create score text and make it dark gray
local scoreText = display.newText(score, 200, 20, native.systemFont, 24)
scoreText:setTextColor( 80, 80, 80 )
–Function to add to score and update scoreText
local function addToScore()
score = score + 1
scoreText.text = score
end
bg:addEventListener(“tap”, addToScore)
–Load highscore value from file. (It will initally be a string.)
highscore = loadFile (“highscore.txt”)
–If the file is empty (this means it is the first time you’ve run the app) save it as 0
local function checkForFile ()
if highscore == “empty” then
highscore = 0
saveFile(“highscore.txt”, highscore)
end
end
checkForFile()
–Print the current highscore
local hs = display.newText(highscore, 100, 20, native.systemFont, 24)
hs:setTextColor( 80, 80, 80 )
–When the app is quit (or simulator refreshed) save the new highscore
–(If score > highscore the data will not be changed)
local function onSystemEvent ()
if score > tonumber(highscore) then --We use tonumber as highscore is a string when loaded
saveFile(“highscore.txt”, score)
end
end
Runtime:addEventListener( “system”, onSystemEvent )