Move a Camera with a Data from a Text file after Build.

Hello.

I try to move camera with a data from a text file after build.
there is a text file which is refreshed while the unity 3d program is running.
And I want to read the text file and use a data in it to move a camera.

I found some information about it and made a code for testing.

using UnityEngine;
using System.Collections;
using System.IO;

public class CameraController : MonoBehaviour {

	public TextAsset textFile;
	string tmps;
	StringReader read = null;

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
		transform.Translate (new Vector3 (0, 0, 1) * Time.deltaTime);
		textFile = (TextAsset)Resources.Load ("/test.txt");
		read = new StringReader (textFile.text);
		if (read == null) {
			GetComponent<TextMesh>().text ="not found";
		} else {
			tmps = read.ReadLine ();
			GetComponent<TextMesh>().text = tmps;
		}
	}
}

There is a error:
NullReferenceException: Object reference not set to an instance of an object
CameraController.Update () (at Assets/Scripts/CameraController.cs:20)

I heard that this way is using text file in MyProject_Data/Resources after build.
But I don’t know that I understood it well.

What is the way to do this? Is this code right?

Resources.Load is used only at runtime to load a pre-created asset. It’s not possible to read a changing file using this API call. Line 20 is presumably failing because you don’t check that the Resources.Load() function has actually worked.