Unity 5 returns strange errors when compiling JavaScript code

Hello! Please help! I have successfully made a level with a Terrain, a Rigidbody FPS Controller from Standard Assets -> Characters and some other GameObjects. I needed a saving system - so I have started to google file implementations in JavaScript. I have found some examples - but it returns compiler errors!

OS is Windows 10 64-bit. Unity version is 5.5.1f1 64-bit. Code editor is Visual Studio 2015, line endings corrected to Windows line endings. Language is JavaScript (UnityScript). Code I have used: #pragma strict import System; import System.IO; var Filename : String = "save.ini"; private var rwfile; var x; var y; var z; var Player : GameObject; private var startTime : int; private var timer1 : int; function TimerSet() {startTime = Time.time;} function TimerUpdate() { timer1 = Time.time; if(timer1 > 60) { Debug.Log("Saving"); Write(); TimerSet();}} function WriterSetup() { Debug.Log("File Writer setup..."); if (!File.Exists(Filename)) { rwfile = File.CreateText(Filename);} rwfile = OpenText(Filename); Debug.Log("File Writer configured sucsessfully");} function Write() { rwfile.open("w"); x = Player.transform.position.x; y = Player.transform.position.y; z = Player.transform.position.z; rwfile.WriteLine(x); rwfile.WriteLine(y); rwfile.WriteLine(z); rwfile.close();} function Start() {Debug.Log("Saver Script Setup"); WriterSetup(); TimerSet();} function Update () {TimerUpdate();} Click here to see my compiling errors in a bigger size