Help creating class

1

Hi!

I am creating a helloWorld example here with actionscript 3.0 but I am having some dificulties.

Here is my class :

Code:
package

{
public class Greeter
{
public function sayHello():String
{
var greeting : String;
greeting = “Say Hello!”;
return greeting;
}
}
}
and here is my code at flash:

Code:
var mygreeter : Greeter = new Greeter();

mainText.text = mygreeter.sayHello();
And here are the error messages I am getting:

1180: Call to a possibly undefined method Greeter.
1046: Type was not found or was not a compile-time constant: Greeter.

What am I doing wrong?

thank you