I got exactly the same message trying out how to make morhps for the first time yesterday(also with AMAPI). The problem in my case was that I modified a nurb, but the object had other nurbs that I did not modify. I exported the whole object again as OBJ, and when I imported it in Poser I got that same error message. When I made sure I deleted all nurbs that I didn't change it worked fine. I just tried the head and it worked fine too. Did you maybe also export the eyes? In that case you would have to deleted the eyes in AMAPI so that when you load the morph only the modified vertices for the head are imported. It makes sense afterwards, but it did take a while for me yesterday to figure that out :-) Marc