fatal: Could not parse object '89a7991111dfd94e4e1d22f53632c703bfdb0fc4'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at 89a7991 Download URLs now point to self-hosted dependencies.
89a7991111dfd94e4e1d22f53632c703bfdb0fc4