fatal: Could not parse object 'd691ab23dff7e58edb9a8d6bf689e54c554abaee'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at d691ab2 Update INSTALL to include information about multiple .conf files
d691ab23dff7e58edb9a8d6bf689e54c554abaee