this aiml was right I looked it up and with Sheila bing chatbot it spits out a error.chatbotexample4.zip
here is the error in the zip file.errorx.zip
This error say use are missing an end tag. Your AIML is not valid AIML or even XML.
Change </star> to <star/>
Your original code works fine, but the code in your error is different.
that worked I look at it wrong in the documentation.