fatal: Could not parse object 'c7788dc9d9e8bb93b67cce3dbace3e79f3d50e4d'.
From https://github.com/NASA-Tensegrity-Robotics-Toolkit/NTRTsim
 * branch            master     -> FETCH_HEAD
HEAD is now at c7788dc Fixing bug in which muscles were controlled
c7788dc9d9e8bb93b67cce3dbace3e79f3d50e4d