Xml guestbook trouble

I’m having some troubles gettting the xml guestbook tutorial to work. I followed the example closely and i cant seem to find out where i went wrong. evertime i try and make an entry into the guestbook it returns “undifined wrote: undefined” serveral times. As I am new to flash and xml i dont even know where to start! I uploaded the sample files in the tutorial aswell and it says the same thing. you can check out my examle here:
the origional sample files are here:
if anyone has any suggestions that would be great!