fatal: Could not parse object '75cd423c52ac1b9b4724cf98e167b866fa69b267'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at 75cd423 experimenting with longer spine.
75cd423c52ac1b9b4724cf98e167b866fa69b267