fatal: Could not parse object '7484f81125ad40c03b66b2ff34c43df7c1771c2f'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at 7484f81 add YAML model builder tutorial
7484f81125ad40c03b66b2ff34c43df7c1771c2f