Class or Interface could not be loaded error on standard components

Question

I am trying to learn how to use Event Listeners. I created a
TextInput field on my screen. In action script I have:
var my_ti:TextInput;
var enterHandler:Object = new Object();
enterHandler.enter = function(e:Object):Void{
trace("entered field");
my_ti.addEventListener("enter", enterHandler);
When I test the movie, I receive the error:
**Error** Scene=Scene 1, layer=Layer 1, frame=1:Line 1: The
class or interface 'TextInput' could not be loaded.
var my_ti:TextInput;
Any tips on fixing this would be greatly appreciated. All
references that I have found to this error message have to do with
paths. Given that this is a standard component, I don't know why it
would be failing or what path to add, if that is indeed the
problem.
TIA

Answer 1

You have the .fla and .as saved in the same file? Or the same folder?
Also you will notice that you have
class ship extends MovieClip
But it looks like for your symbol you have given it a defintion of Ship. (Caps matter!)
Your code should be capitalized, as should the name of the Ship.as file. You will notice that the Flash classes all start with a cap and that instances start with lowercase letters. You don't have to do this, but it makes it easier to know what is what.
As a recommendation I would recommend the book by Keith Peters, Making things move. And also unless you have an overwhelming need to learn AS2, I would recommend skipping it and moving right to AS3.