Thank You for your reply. Sorry I left out this detail, but I have tried this with a different model and project all together (not the ones packaged with opensim), and it did work. But the same model that It is giving me trouble with, worked on the other computer. So I do not believe it is an issue ...

I am having trouble with the OpenSim::Object::print function in the opensim api for cpp. I have a project for forward dynamic simulation of a lower extremity standing model in which i have modified the feet to add contact spheres using hunt crossley. When i try to export the modified model to an xml...