fatal: Could not parse object '638ad3711fc4dbf93ecdc0235792e759b9d4bec8'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at 638ad37 Added copy constructor to tgStructure to copy m_children rather than keep references (as the automatic copy constructor did)
638ad3711fc4dbf93ecdc0235792e759b9d4bec8