I am trying to create a chat history using the Skype API with the Cocoa interface.

But I have got a problem : when I send the command to get the chatmessages of a chat :
"GET CHAT <chat_id> CHATMESSAGES"
the response is :
"CHAT <chat_id> CHATMESSAGES "
without anything else,
is it a known bug for Mac OS X or do I have something more to do ?