It isn't giving you an error because it's doing exactly what it is supposed to do, it will sit forever and wait for someone to send it an IM, then it will pass that message to the sub you specified in the callback argument.

Update: My bad, I thought you had called ui_dataget, which waits for an incoming packet, but you didn't, so this is the wrong answer...

More useful update: Your aim_agent value has a different format than the default, and the docs say that "There have been some reports that changing this may cause TOC servers to stop responding to signon requests", which seems to be the case, if I remove the aim_agent line from your constructor, it works.