fatal: Could not parse object '68b81230d2aa179d0ac2a5820da5c5db7569ddda'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at 68b8123 Added doxygen generator.
68b81230d2aa179d0ac2a5820da5c5db7569ddda