fatal: Could not parse object '1c83f910af470b81908c8ac787175a2afe2e4f83'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at 1c83f91 Cables with contact dynamics have been added to the model.
1c83f910af470b81908c8ac787175a2afe2e4f83