You have to make sure you're including the Xtra's in the projector. You do that like this:
Modify-->Movie-->Extras
In the listbox there you should see the BuddyApi Xtra there. If not, you need to add it. When you select the Buddy Api Xtra from the list, there are two check boxes beneath it. One says 'include in projector.' This must be checked for any calls to BuddyApi to work within a projector. Hope that helps