fatal: Could not parse object 'f791dc4884a4ddc1e74edc6257fcfa0158eaf612'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at f791dc4 First pass on a CPG Hierarchy for MountainGoat.
f791dc4884a4ddc1e74edc6257fcfa0158eaf612