IDE :: Loading External Document Into Dynamic Flash TextBox

How I can load an external .txt document into a designated dynamic text box in my flash document. I've tried the two tutorials I could find on flashkit.com and neither of them worked for me. I did everything as told and still the text file didn't load. When I enter the actionscript into the editor, I'll click check syntax and I get an error!

Here's the code I have in the first frame of my actions layer:
stop();
loadText = new loadVars();
loadText.load("updates.txt");
//creating the loadVarsText function
loadText.onLoad = function() {
[Code] .....

Here's what the error is:
**Warning** Symbol=text, layer=actions,
frame=1:Line 2: The identifier 'loadVars' will not resolve to built-in object 'LoadVars' at runtime.
loadText = new loadVars();
Total ActionScript Errors: 1
Reported Errors: 1