Need help with the basics

i’m trying to do the tutorials, and i have a problem with the 3rd one, the missile part
when i test the movie, i get the following error:

symbol=missile, layer=layer1, frame 1, line 1. The class or interface ‘Missile’ could not be loaded.

Flash is case sensitive when you created the symbol did you use Missile for the name, class ect or missile? try recreating the object using a upper case M and it should work :)

or maybe you typed the start of the class incorrectly you may have started the class with:

class missile extends MovieClip

instead of

class Missile extends MovieClip

yup, that’s what happened. i saved the .as file with a lowercase m instead of an uppercase… funny thing though, “save as” didn’t seem to fix the problem, i had to create the file from scratch and then it was ok.
thank you!