Unity 5 unityscript returns errors when trying to write to a file - unity3d

Question

I have successfully made a level with a Terrain, a Rigidbody FPS Controller from Standard Assets -> Characters and some other GameObjects. I now need to save my system so I have started to google file IO for UnityScript. I have found some examples but they return compiler errors (details below).
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 UnityScript. Code I have used:
#pragma strict
import System;
import System.IO;
var Filename : String = "save.ini";
private var rwfile : StreamWriter;
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);}
Debug.Log("File Writer configured sucsessfully");}
function Write() {
rwfile = File.CreateText(Filename);
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();}
My error:

Answer 1

Your error is telling you that it dosen't know what OpenText is. I don't see in your code anything about a function called OpenText, so i guess you were trying to use the File.OpenText function so you should change this line
rwfile = OpenText(Filename);
To this
rwfile = File.OpenText(Filename);
Also for the other errors you need to assigne your rwfile to a StreamWriter
private var rwfile : StreamWriter;
You should also change your Write function for this:
function Write() {
x = Player.transform.position.x;
y = Player.transform.position.y;
z = Player.transform.position.z;
using (rwfile = File.CreateText(Filename))
{
rwfile.WriteLine(x);
rwfile.WriteLine(y);
rwfile.WriteLine(z);
rwfile.Close();
}
}