fatal: Could not parse object 'ae61baa9b8b2a5f65dbb9220d31ef70e686db2e2'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at ae61baa Added crater and craterdeep to core/terrain
ae61baa9b8b2a5f65dbb9220d31ef70e686db2e2