fatal: Could not parse object '31eb519b9e05c44fd0f3dcb67eb538e594d530d8'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at 31eb519 Added comment to sed using gcc.
31eb519b9e05c44fd0f3dcb67eb538e594d530d8