i did. Did you watch the video? So Yeah EDIT by Moderator: merged posts, please use the edit button instead of double posting.
That's because you've saved it using a Rich Text Editor that has messed up the file's encoding. You should use software like TextMate or put TextEdit into 'PLAIN TEXT' mode by going to the application's preferences and selecting the appropriate option. Please note that after modifying the 'New Document' settings in TextEdit, you MUST close the file you are currently working on by clicking the red X in the textedit window - then press COMMAND + N to create a new file.